Question 69

A man takes twice as long to go upstream as to row downstream. What is the ratio of speed of boat in still water and the speed of stream?

Solution

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Let speed of man upstream= x kmph & his speed downstream = 2x kmph

Hence the ratio will be , $$\frac{2x+x}{2} : \frac{2x-x}{2}$$

                                    $$\frac{3x}{2} : \frac{x}{2}$$

                                       ⇒3:1

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