Question

The downstream speed of a boat is 4 km/hr more than its upstream speed and the ratio of the speed of the boat in still water to the speed of the stream is 5:2. Find the total time taken by boat to travel 42 km downstream and 30 km upstream?

A 12 hrs
B 18 hrs
C 16 hrs
D 9.5 hrs
E 10 hrs
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