Question : If a car is running with a speed of 90 km/h, then how much distance will it cover in 1 hour 15 minute?
Correct Answer 112.5 kilometer
Solution & Explanation
Solution
Given, speed of the car = 90 km/h
And, time = 1 hour 15 minute
= 1 hour + 15 1/ 60 4 hour
= 1 + 1/4 hour
= 1 + 0.25 hour
Thus, time = 1.25 hour
Calculation of distance using formula when speed and time are given
We know that
Distance = Speed × Time
Therefore, the distance covered by the car with the given speed and time
= 90 km/h × 1.25 hour
= 112.5 km
Thus, distance covered by the car = 112.5 km Answer
Calculation of distance using unitary method when speed and time are given
Given, speed of the car = 90 km/h
And, time = 1 hour 15 minute
= 1 hour + 15 1/ 60 4 hour
= 1 + 1/4 hour
= 1 + 0.25 hour
Thus, time = 1.25 hour
∵ In 1 hour, the distance covered by the car = 90 km
∴ In 1.25 hour, the distance covered by the car = 90 × 1.25 km
= 112.5 km
Thus, distance covered by the car = 112.5 km Answer
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