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Q.
The current of a stream at 1 kmph. A motor boat goes 35 km upstream and back to the starting point in 12 hours. The speed of the motor boat in still water is ?
A.
8 kmph
B.
6 kmph
C.
7.5 kmph
D.
5.5 kmph
View Answer
Correct choice: B
Explanation:
Speed of the stream = 1 Motor boat speed in still water be = x kmph Down Stream = x + 1 kmph Up Stream = x - 1 kmph [35/(x + 1)] + [35/(x - 1)] = 12 x = 6 kmph
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