A boatman goes 2 km against the current of the stream in 2 hour and goes 1 km along the current in 20 minutes. How long will it take to go 5 km in stationary water?	Choose the most appropriate option: A) 2 hr 30 min B) 2 hr C) 4 hr D) 1 hr 15 min E) None of these
Explanation :   Speed upstream = 2/2= 
<gadget id="calculator">2/2</gadget>
<output>1</output>
1 km/hr   Speed downstream= 1/((20/60))= 
<gadget id="calculator">1/((20/60))</gadget>
<output>3</output>
3 km/hr   Speed in still water= 1/2(3+1) = 2 km/hr   Time taken to travel 5 km in still water = 5/2 = 2(1/2) hours = 2 hour 30 minutes. 2 hr 30 minnswer : Option 2 hr 30 min
<result>A</result>
A boatman goes 2 km against the current of the stream in 2 hour and goes 1 km along the current in 20 minutes. How long will it take to go 5 km in stationary water?