Question
A boat goes 7 km an hour in still water, but takes twice
as much time in going the same distance against the current. The speed of the current (in km/hour) is :Solution
Let the speed of the current be x kmph. According to the question, 7/(7 – x) = 2 ⇒ 14 – 2x = 7 ⇒ 2x = 14 – 7 ⇒ x = 7/2 = 3.5 km/hr
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