Question
A motorboat in still water travels at a speed of 25
km/hr. It goes 35 km upstream in 1 hours 45 minutes. The time taken by it to cover the same distance down the stream will be :Solution
Speed of the motorboat upstream = 35/(7/4) = 20 km/hr Let the speed of the current be x km/hr ⇒ 25 – x = 20 ⇒ x = 5 km/hr Speed of motor boat downstream = 25 + 5 = 30 km/hr Time taken to cover 35 km at 30 km/hr = 35/30 = 1 hour 10 minutes
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