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The downstream speed of a boat is 5 km/hr more than its upstream speed and the ratio of the speed of the boat in still water to the speed of the stream is 19: 5. Find the total time taken by boat to travel 42 km downstream and 31.5 km upstream? (a) 7 ½ hr (b) 8 hr (c) 9 hr (d) 9 ½ hr (e) 10 hr

Posted on : Sept. 8, 2021

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