Question
A boat is moving 3 km against the current of the stream
in 1 hour and moves 1 km in the direction of the current in 12 minutes. How long will it take the boat to go 6 km in stationary water?Solution
Speed of upstream = 3km/hr Speed of downstream = 1 km/12 min 1 km/(12/60) hr = 5 km/hr Speed of boatman = (3 + 5)/2 = 4 km/hr Time is taken by the boatman to go 6 km in stationary water = 6/4 hr 1 hr + (1/2) x 60 min 1 hr 30 min
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