Question
Speed of a motorboat in still water is 45 km per hour if
the motorboat travels 80 km along the stream in 1 hour 20 minutes, then the time taken by it to cover the same distance against the stream will beSolution
Let the speed of boat in still water =B and speed of stream =S B=45km/h 
B+S=60 S =60-45=15km/h Upstream speed=B-S=45-15=30km/h Time =Distance/Upstream speed =80/30=2hours 40min.
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