Question

A man can row at a speed of $10 \mathrm{~km} / \mathrm{hr}$ in still water to a certain upstream point and back to the starting point in a river which flows at $4 \mathrm{~km} / \mathrm{hr}$. Find his average speed for total journey. (a) $9 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$ (b) $8 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$ (c) $11 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$ (d) None of these

   A man can row at a speed of $10 \mathrm{~km} / \mathrm{hr}$ in still water to a certain upstream point and back to the starting point in a river which flows at $4 \mathrm{~km} / \mathrm{hr}$. Find his average speed for total journey.
(a) $9 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$
(b) $8 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$
(c) $11 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$
(d) None of these

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The Pearson Guide to Objective Arithmetic for Competitive Examinations

The Pearson Guide to Objective Arithmetic for Competitive Examinations

Dinesh Khattar 2nd Edition

Chapter 16, Problem 10

Instant Answer

Step 1

- The speed of the man in still water is \(10 \mathrm{~km/hr}\). - The speed of the river current is \(4 \mathrm{~km/hr}\). - When rowing upstream, the effective speed is: \[ \text{Upstream speed} = \text{Speed in still water} - \text{Speed of current} Show more…

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A man can row at a speed of $10 \mathrm{~km} / \mathrm{hr}$ in still water to a certain upstream point and back to the starting point in a river which flows at $4 \mathrm{~km} / \mathrm{hr}$. Find his average speed for total journey. (a) $9 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$ (b) $8 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$ (c) $11 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$ (d) None of these

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