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Discussion :: Boats and Streams

1. 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?

2.  A. 40 minutes B. 1 hour C. 1 hr 15 min D. 1 hr 30 min

Explanation :

Rate downstream =[$$\frac { 1 } {10 }*60]$$km/hr = 6 km/hr.

Rate upstream = 2 km/hr.

Speed in still water =$$\frac { 1 } { 2 }(6+2)$$km/hr = 4 km/hr

Required time =$$[\frac {5 } { 2 }]$$hrs=1$$\frac { 1 } { 4 }$$hrs= 1hr 15min

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