Question:
By running at a speed of 23 km/h how much distance a bus will cover in 9 second?
Correct Answer
57.51 meter
Solution And Explanation
Solution
Given,
Speed = 23 km/h
Time = 9 second
Thus, distance = ?
Here the speed is given in the kilometer per hour while the time is in the second. So, for the ease of calculation, the speed should be converted into meter per second.
Conversion of the speed from kilometer per hour to meter per second
To convert kilometer per hour, the speed is multiplied by 5/18
Therefore, 23 km/h = 23 × 5/18 m/s
= 23 × 5/18 m/s
= 115/18 = 6.39 m/s
Thus, speed = 6.39 m/s
Calculation of distance using formula
Formula to calculate distance when speed and time are given
Distance = Speed × Time
⇒ Distance = 6.39 m/s × 9 s = 57.51 m
Thus, distance = 57.51 meter Answer
Calculation of distance using Unitary Method
∵ In 1 second the distance covered = 6.39 meter
∴ In 9 second, the distance covered = 6.39 m × 9 = meter
Thus, distance = 57.51 meter Answer
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(3) By running at a speed of 7 km/h how much distance a motor bike will cover in 8 second?
(4) By running at a speed of 50 km/h how much distance a bus will cover in 9 second?
(5) A car covers a distance of 350 km in 10 hours. Find the speed and distance covered in 8 hours by the given car.
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(10) Find the distance covered by a cricket ball in 27 hours if it covers a distance of 84 km in 17 hours.