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The odometer of a car reads 2000 km at...

The odometer of a car reads ` 2000 km ` at the start of a trip and `2400 km` at the end of the trip . If the trip took `8 h` , calculate the average speed of the car in `km//h and m//s`.

A

13.9 m/s

B

12.9 m/s

C

10.9 m/s

D

10 m/s

Text Solution

Verified by Experts

The correct Answer is:
13.9 m/s
Distance covered by the car,
s = 2400 km – 2000 km = 400 km
Time elapsed, t = 8 h
Average speed of the car is,
`v_(av)=(s)/(t)=(400 km)/(8 h)`
`=50 Km h^(-1)`
`=50(km)/(h)xx(1000 m)/(1 km)xx(1 h)/(3600s)`
`=13.9 ms^(-1)`
The average speed of the car is `50 km h^(-1)` or `13.9 mc ^(-1)`
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