A man can row 3/4 of a km against the stream in 11 1/4 minutes and returns in 7 1/2 minutes. Find the speed… · ABC26GN3810

Subject: General Aptitude · Chapter: Boats and Streams · Exam: M.A.T. 2008

A man can row $\frac{3}{4}$ of a km against the stream in $11 \frac{1}{4}$ minutes and returns in $7 \frac{1}{2}$ minutes. Find the speed of the man in still water.

(a)3 km/hr

(b)4 km/hr

(c)5 km/hr

(d)6 km/hr

Answer

No answer key was printed for this question.

Explanation

Rate upstream $=\left(\frac{750}{675}\right) \mathrm{m} / \mathrm{sec}=\frac{10}{9} \mathrm{m} / \mathrm{sec}$; Rate downstream $=\left(\frac{750}{450}\right) \mathrm{m} / \mathrm{sec}=\frac{5}{3} \mathrm{m} / \mathrm{sec}$. $\therefore \quad$ Rate in still water $=\frac{1}{2}\left(\frac{10}{9}+\frac{5}{3}\right) \mathrm{m} / \mathrm{sec}=\frac{25}{18} \mathrm{m} / \mathrm{sec}=\left(\frac{25}{18} \times \frac{18}{5}\right) \mathrm{km} / \mathrm{hr}$ $=5 \mathrm{km} / \mathrm{hr}$.

Study loop for Boats and Streams

1. Practise the PYQsPrevious-year questions, with answers

· Browse this chapter in the app