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1. A river 2 km wide is flows at the rate of 2km/h. Aboatman who can row a boat at a speed o4 km/h in still water, goes a distance of 2 kmupstream and then comes back. The time taken byhim to complete his journey is(1) 60 min (2) 70 min (3) 80 min (4) 90 min

Answer»

Speed of water is 2 Km/hr,

Speed of Boat is 4 Km/hr,

Up stream Speed = 4-2 = 2 Km/hr

Down Stream Speed = 2+4 = 6 Km/hr

So Total time = 2/6 + 2/2 =4/3 hr =4/3*60 =80 min



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