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A boat takes thrice as much time to sail in the upstream of a river as it would have taken to sail in the downstream. If the speed of the water is 5 km/hr, then the speed of boat in still water is ?
4 km/hr
6 km/hr
10 km/hr
12 km/hr
Distance to be covered is same.
So speed ratio and Time ratio is inverse.
Time Taken -----> Downstream : Upstream
1 : 3
Speed Ratio -----> Downstream : Upstream
3 : 1 => 3x , x
Water's Speed = (3x - x)/2 = x => 5km/hr.
Speed of the Boat in still water = (3x + x)/2 = 2x => 10 km/hr.
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