Question

The speed of a motorboat in still water is 25 km/h and the speed of the stream is 5 km/h. The boat first goes 120 km downstream and then covers a certain distance upstream which is x% less than the distance travelled downstream. If the total time taken for the whole journey is 7 hours, then find ‘x’.

A 35
B 20
C 40
D 28
E None of these
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