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
Speed of boat = 13 km/hr and speed of stream = 4 km/hr
When going in opposite direction i.e. upstream, relative speed = 13-4 = 9 km/hr
=> Time taken to go 63 km upstream = $$\frac{distance}{speed}$$
= $$\frac{63}{9}$$ = 7 hours
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