Question

A boatman goes to kilometre 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

Answer 1

Rate downstream =1x 60km/hr = 6 km/hr.10

Rate upstream = 2 km/hr.

Speed in still water =1(6 + 2) km/hr = 4 km/hr.2

 Required time =5hrs = 11hrs = 1 hr 15 min

Answer 2

Rate downstream =(1/10×60)km/he=6km/hr
Rate upstream = 2 km/hr
Speed in still water =1/2(6+2) km/hr=4km/hr
required time=5/4hrs=1¼hrs=1 hr 15min

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