Speed of the motorboat upstream = 56/(7/4) = 32 km/hr Let the speed of the current be x km/hr ⇒ 40 – x = 32 ⇒ x = 8 km/hr Speed of motor boat downstream = 40 + 8 = 48 km/hr Time taken to cover 56 km at 48 km/hr = 56/48 = 1 hour 10 minutes
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