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A boatman goes 4 km against the current of the stream in 1 hour and goes 2 km along the current in 10 minutes. How long will it take to go 24 km in stationary water?
5hrs
3hrs
2hrs
6hrs
Upstream=4/1=4km/hr Downstream=2*60/10=12km/hr Speed in still water=(12+4)/2 =16/2=8km/hr. For 24 km time=24/8 =3hrs.
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