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?  Pick:
A) 2 hr 30 min
B) 2 hr
C) 4 hr
D) 1 hr 15 min
E) 3 hr 15 min
Explanation:   Speed upstream =2/2= 
<gadget id="calculator">2/2</gadget>
<output>1</output>
1km/hr   Speed downstream=1/(20/60)= 
<gadget id="calculator">1/(20/60)</gadget>
<output>3</output>
3km/hr   Speed in still water=1/2(3+1)=2km/hr   Time taken to travel 5 km in still water   =5/2=2(1/2)hours=2 hour 30mins   2 hr 30 minNSWER IS 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?