Question
A motorboat in still water travels at a speed of 39
km/hr. It goes 35 km upstream in 1 hour 15 minutes. The time taken by it to cover the same distance down the stream will be :Solution
Speed of the motorboat upstream = 35/(5/4) = 28 km/hr Let the speed of the current be x km/hr ⇒ 39 – x = 28 ⇒ x = 11 km/hr Speed of motor boat downstream = 39 + 11 = 50 km/hr Time taken to cover 35 km at 50 km/hr = 35/50 = 7/10 hours or 42 minutes
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