Between two stations a train accelerates uniformly at first, then moves with constant speed and finally retards uniformly. If the ratios of time taken are 1:8:1 and the greatest speed is 60km/hr, find the average speed over the whole journey.
A
25kmph
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B
50kmph
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C
54kmph
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D
72kmph
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Solution
The correct option is C54kmph Below given v−t graph shows the motion given in question