A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?
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Upstream speed =2km/hr
Downstream speed=1/(1/6)km/hr=6 km/hr
Let speed of stream be x and that of boat be y..
y+x=6......eq1. y-x=2.....eq2. adding eq1 and eq2.... 2y=8.....y=4 km/hr...From eq1 x=6-y....x=2 km/hr
To go 5 km in still water, time =5/4=1.25 hr i.e 1 hour and 15 mins
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