A train starting from rest travels the first part of its journey with constant acceleration a, second part with
constant velocity and third part with constant retardation a, being brought to rest. The average speed for
the whole journey is 7v/8The 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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Answer:
3/4 is the right answer
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