Question
A boat can cover 12 kilometers in still water in 40
minutes. If the speed of the current is 2 kilometers per hour, then what is the average speed it takes to go from one place downstream to another and from the second place to the first place upstream? will run from type-sscSolution
. Let the speed of boat in still water =B and speed of stream =S Speed of boat in still water B= 12×3) /2=18km/h S=2km/h Speed of boat in downstream = (18+2) =20km/h Speed of boat in upstream = (18-2) =16km/h Average Speed = (2×16×20)/ (20+16) =640/36=17.77km/h
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