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A boat?s speed with the current is 15 kmph and the boat?s speed against the current is 5 kmph. What is the speed of the current?

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A boat?s speed with the current is 15 kmph and the boat?s speed against the current is 5 kmph. What is the speed of the current?
1). 15 kmph
2). 10 kmph
3). 5 kmph
4). 20 kmph

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1 answers

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Solution

With the current => downstream
Against the current => upstream
Let the speed of the boat be ‘s’ and the speed of the river be ‘r’.
So, s - r = 5 and s + r = 15
=>2s = 20 => s = 10 and r = 5 kmph
Speed of the current = 5 kmph

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