ABC26GN3808 · Boats and Streams

Subject: General Aptitude · Chapter: Boats and Streams · Exam: 2008 · Marks: · Difficulty:

If a man goes 18 km downstream in 4 hours and returns against the stream in 12 hours, then the speed of the stream in km/hr is

(a)1

(b)1.5

(c)1.75

(d)3

Answer

Answer (as printed): B

Explanation

Speed downstream $=\left(\frac{18}{4}\right) \mathrm{km} / \mathrm{hr}=4.5 \mathrm{km} / \mathrm{hr}$; Speed upstream $=\left(\frac{18}{12}\right) \mathrm{km} / \mathrm{hr}=1.5 \mathrm{km} / \mathrm{hr}$. ∴ Speed of the stream $=\frac{1}{2}(4.5-1.5) \mathrm{km} / \mathrm{hr}=1.5 \mathrm{km} / \mathrm{hr}$.

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