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?
সমাধান
সঠিক উত্তর: Option C
Rate downstream = 1/10 x 60 km/hr = 6 km/hr. Rate upstream = 2 km/hr.
Speed in still water = 1/2 (6 + 2) km/hr = 4 km/hr. Required time = 5/4 hrs = 1 hr 15 min.