a boat can travel with a speed of 13 km/hr in still water. if the speed of str

Question

a boat can travel with a speed of 13 km/hr in still water. if the speed of stream is 4 km/hr in the same direction, time taken by boat to go 63 km in opposite direction is:

Options:

A . 8 hrs

B . 4 hrs

C . 7 hrs

D . 9 hrs

Answer: Option C
Explanation :

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