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Between two stations a train starting fr...

Between two stations a train starting from rest first accelerates uniformly, then moves with constant velocity and finally retarts uniformly to come to rest. If the ratio of the time taken be `1 : 8 : 1` and the maximum speed attained be `60 km//h`, then what is the average speed over the whole journey ?

A

25 km/hr

B

54 km/hr

C

40 km/hr

D

50 km/hr

Text Solution

Verified by Experts

The correct Answer is:
A
`v_(av) = ("Total distance")/("Total time")`
Total distance = Area below `v - t` curve
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