Question

The speed of current is 9 km/h. What will be the respective downstream speed and upstream speed of a boy rowing a boat, if one seventh of the distance covered going downstream in a certain time is equal to the distance covered going upstream in the same time?

A 21 km/h, 3 km/hr
B 27 km/h, 9 km/hr
C 20 km/h, 10 km/hr
D 16 km/h, 4 km/hr
E None of these
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