The current of a stream runs at 2 km/hr. A boat takes half time in moving a certain distance downstream than upstream. What is speed of boat on still water?
A. 8
B. 6
C. 5
D. 4
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Rate of stream =2 km/hr.
Let speed of man in still water = x km/hr and Distance = d.
Upstream speed = (x - 2) km/hr Downstream speed = (x + 2) km/hr.
Now,
2d / (x+2) = d/ (x-2) .
=> 2x - 4 = x + 2.
=> x = 6 km/hr.