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
Solution
Correct Answer: Option C
Ratedownstream =(1/10×60)km/hr =6km/hr Rateupstream=2km/hr Speed in still water =1/2(6+2)km/hr =4km/hr ∴Requiredtime=5/4hrs =1 (1/4)hrs =1 hr 15min.
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