Time and Distance - Arithmetic
Solved Examples -5
Conversion of meter per second to kilometer per hour
p meter per second = how much kilometer per hour?
Step (1) Convert meter to kilometer
(∵ 1 kilometer = 1000 meter; So, 1 meter = 1/1000 kilometer)
Step (2) Convert the second into hour
(∵ 1 hour = 3600 second; so, 1 second = 1/3600 hour)
Thus, p meter per second
Thus, to convert meter per second to kilometer per hour, you need to multiply it with 18/5 or with 3.6
Solved Examples-5
Conversion of meter per second to kilometer per hour
Multiple Choice Questions
Choose the correct option
Question (1) If a cyclist is running with a speed of 5 meter per second, what will be his speed in kilometer per hour?
(a) 10 km/h
(b) 5 km/h
(c) 15 km/h
(d) 18 km/h
Answer : (d) 18 km/h
Solution
Here given speed = 5 m/s
Thus, speed in km/h = ?
We know that 1 km = 1000 meter
Thus, 1 meter = 1/1000 km
And 1 hour = 3600 second
Thus, 1 second = 1/3600 hour
Thus, 5 m/s
= 18 km/h
Thus, 5 m/s = 18 km/h Answer
Shortcut Method to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 18/5
Thus, 5 m/s
= 18 km/h
Thus, 5 m/s = 18 km/h Answer
Shortcut Method (2) to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 3.6
Thus, 5 m/s
= 5 × 3.6 km/h
= 18 km/h
Thus, 5 m/s = 18 km/h Answer
Question (2) If a cyclist is running with a speed of 7.5 meter per second, what will be his speed in kilometer per hour?
(a) 15 km/h
(b) 10 km/h
(c) 27 km/h
(d) 18 km/h
Answer : (c) 27 km/h
Solution
Here given speed = 7.5 m/s
Thus, speed in km/h = ?
We know that 1 km = 1000 meter
Thus, 1 meter = 1/1000 km
And 1 hour = 3600 second
Thus, 1 second = 1/3600 hour
Thus, 7.5 m/s
= 1.5 ×18 km/h
= 27 km/h
Thus, 7.5 m/s = 27 km/h Answer
Shortcut Method to change meter per second to kilometer per hour
We know that to change meter per second to kilometer per hour, we need to multiply the given speed with 18/5
Thus, 7.5 m/s
= 1.5 ×18 km/h
= 27 km/h
Thus, 7.5 m/s = 27 km/h Answer
Shortcut Method (2) to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 3.6
Thus, 7.5 m/s
= 7.5 × 3.6 km/h
= 27 km/h
Thus, 7.5 m/s = 27 km/h Answer
Question (3) If a car is running with a speed of 10 meter per second, what will be his speed in kilometer per hour?
(a) 12 km/h
(b) 24 km/h
(c) 36 km/h
(d) 18 km/h
Answer : (c) 36 km/h
Solution
Here given speed = 10 m/s
Thus, speed in km/h = ?
We know that 1 km = 1000 meter
Thus, 1 meter = 1/1000 km
And 1 hour = 3600 second
Thus, 1 second = 1/3600 hour
Thus, 10 m/s
= 36 km/h
Thus, 10 m/s = 36 km/h Answer
Shortcut Method to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 18/5
Thus, 10 m/s
= 2 × 18 km/h
= 36 km/h
Thus, 10 m/s = 36 km/h Answer
Shortcut Method (2) to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 3.6
Thus, 10 m/s
= 10 × 3.6 km/h
= 36 km/h
Thus, 10 m/s = 36 km/h Answer
Question (4) If a car is running with a speed of 15 meter per second, what will be his speed in kilometer per hour?
(a) 18 km/h
(b) 36 km/h
(c) 54 km/h
(d) 24 km/h
Answer : (c) 54 km/h
Solution
Here given speed = 15 m/s
Thus, speed in km/h = ?
We know that 1 km = 1000 meter
Thus, 1 meter = 1/1000 km
And 1 hour = 3600 second
Thus, 1 second = 1/3600 hour
Thus, 15 m/s
= 3 × 18 km/h
= 54 km/h
Thus, 15 m/s = 54 km/h Answer
Shortcut Method to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 18/5
Thus, 15 m/s
= 3 × 18 km/h
= 54 km/h
Thus, 15 m/s = 54 km/h Answer
Shortcut Method (2) to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 3.6
Thus, 15 m/s
= 15 × 3.6 km/h
= 54 km/h
Thus, 15 m/s = 54 km/h Answer
Question (5) If a car is running with a speed of 20 meter per second, what will be his speed in kilometer per hour?
(a) 36 km/h
(b) 45 km/h
(c) 60 km/h
(d) 72 km/h
Answer : (d) 72 km/h
Solution
Here given speed = 20 m/s
Thus, speed in km/h = ?
We know that 1 km = 1000 meter
Thus, 1 meter = 1/1000 km
And 1 hour = 3600 second
Thus, 1 second = 1/3600 hour
Thus, 20 m/s
= 2 × 36 km/h
= 72 km/h
Thus, 20 m/s = 72 km/h Answer
Shortcut Method to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 18/5
Thus, 20 m/s
= 4 × 18 km/h
= 72 km/h
Thus, 20 m/s = 72 km/h Answer
Shortcut Method (2) to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 3.6
Thus, 20 m/s
= 72 km/h
Thus, 20 m/s = 72 km/h Answer
Question (6) If a car is running with a speed of 22.5 meter per second, what will be his speed in kilometer per hour?
(a) 71 km/h
(b) 81 km/h
(c) 91 km/h
(d) 101 km/h
Answer : (b) 81 km/h
Solution
Here given speed = 22.5 m/s
Thus, speed in km/h = ?
We know that 1 km = 1000 meter
Thus, 1 meter
And 1 hour = 3600 second
Thus, 1 second = 1/3600 hour
Thus, 22.5 m/s
= 2.25 × 36 km/h
= 81 km/h
Thus, 22.5 m/s = 81 km/h Answer
Shortcut Method to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 18/5
Thus, 22.5 m/s
= 81 km/h
Thus, 22.5 m/s = 81 km/h Answer
Shortcut Method (2) to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 3.6
Thus, 22.5 m/s
= 22.5 × 3.6 km/h
= 81 km/h
Thus, 22.5 m/s = 81 km/h Answer
Question (7) If a car is running with a speed of 25 meter per second, what will be his speed in kilometer per hour?
(a) 60 km/h
(b) 75 km/h
(c) 81 km/h
(d) 90 km/h
Answer : (d) 90 km/h
Solution
Here given speed = 25 m/s
Thus, speed in km/h = ?
We know that 1 km = 1000 meter
Thus, 1 meter = 1/1000 km
And 1 hour = 3600 second
Thus, 1 second
Thus, 25 m/s
= 2.5 × 36 km/h
= 90 km/h
Thus, 25 m/s = 90 km/h Answer
Shortcut Method to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 18/5
Thus, 25 m/s
= 5 × 18 km/h
= 90 km/h
Thus, 25 m/s = 90 km/h Answer
Shortcut Method (2) to change meter per second to kilometer per hour
We know that, to change meter per second to kilometer per hour, we need to multiply the given speed with 3.6
Thus, 25 m/s
= 25 × 3.6 km/h
= 90 km/h
Thus, 25 m/s = 90 km/h Answer
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