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?
a. 40 minutes
b. 1 hour
c. 1 hr 15 min
d. 1 hr 30 min
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Let speed of still water =y Let sped of stream= x Downstream =x+y Upstream =x-y x-y=2_--1 x+y=6_---2 Add both equation 2x=8 x=4 Total speed =8 Time taken in 5 km=5*8=40min
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