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A train starting from rest travels the f...

A train starting from rest travels the first part of its journey with constant acceleration a , second part with constant velocity v and third part with constant retardation a, being brough to rest. The average speed for the whole journely is `(7v)/(8)` . For what fraction of the total time, the train travels with constant velocity ?

A

`1//2`

B

`3//4`

C

`5//3`

D

`5//8`

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The correct Answer is:
B
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