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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, secondpart with constant velocity v nd third part with constant retardation a, being brought to rest.the average speed for the whole journey is7v8. The train travels with constant velocity for...of the total time -

A

`3/4`

B

`7/8`

C

`5/6`

D

`9/7`

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The correct Answer is:
A
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