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 kmphB) 6 kmphC) 7.5 kmphD) 5.5 kmph
The current of a stream at 1kmph
Answer: B) 6 kmph
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
Subject: Boats and Streams – Quantitative Aptitude – Arithmetic Ability
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