The effective speed of travel of a boat downstream is 20 kmph whereas it is 10 kmph upstream. What is the speed of the current?

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Let the speed of the boat and that of the current be ‘x’ and ‘y’ kmph x + y = 20 & x - y = 10 x = 15 kmph and y = 5 kmph speed of the current = 5 kmph

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