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Question

# The odometer of a vehicle has an initial reading of 1000 km. After the trip, it shows a reading of 1540 km. If the time taken for the trip is 5 hours, what is the average speed of the vehicle in m s−1?

A
10
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B
20
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C
30
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D
40
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Solution

## The correct option is C 30Initial reading of the odometer = 1000 km Final reading of the odometer = 1540 km Distance covered by the car = Final reading of the odometer – Initial reading of the odometer = 1540 - 1000 = 540 km = 540 x 1000 m = 54000 m Hence, time taken = 5 hr = 5 x 60 x 60 s = 18000 s Average Speed = DistanceTime = 54000018000 = 30 m s−1 Thus, the average speed of the vehicle is 30 ms−1.

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