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Class 10 > Learn Mathematics > A diver rowing at the rate of 5 km/h in still water...
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A diver rowing at the rate of 5 km/h in still water takes double the time in going 40 km upstream as in going 40 km downstream. Find the speed of the stream.

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Time = Distance/Speed. Let us assume the speed of the stream is equal to x km/hr. The speed for upstream will be equal to x-5 km/hr. the speed for downstream will be equal to x+5 km/hr. Since in upstream the stream will resist against but in downstream it will aid. The time taken to dive upstream = 40/(x-5)...
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Time = Distance/Speed. Let us assume the speed of the stream is equal to x km/hr. The speed for upstream will be equal to x-5 km/hr. the speed for downstream will be equal to x+5 km/hr. Since in upstream the stream will resist against but in downstream it will aid. The time taken to dive upstream = 40/(x-5) hr, the time taken for downstream = 40/(x+5) hr. Since 40/(x-5) = 2*40(x+5), x=15 km/hr. read less
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