A boatman rows 1 km in 5 minutes, along the stream and 6 km in 1 hour against the stream. The speed of the… · ABC26GN3806
Subject: General Aptitude · Chapter: Boats and Streams · Exam: S.S.C. 2010
A boatman rows 1 km in 5 minutes, along the stream and 6 km in 1 hour against the stream. The speed of the stream is
(a)3 kmph
(b)6 kmph
(c)10 kmph
(d)12 kmph
Answer
Explanation
Rate downstream $=\left(\frac{1}{5} \times 60\right) \mathrm{kmph}=12 \mathrm{kmph}$; Rate upstream = 6 kmph. Speed of the stream $=\frac{1}{2}(12-6) \mathrm{kmph}=3 \mathrm{kmph}$.
Explanation as extracted from the printed page; notation may be imperfect.
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