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?	Select the correct option
A) 4hr	B) 25 min	C) 45 min	D) 6 hr	E) 2 hr 30 min
2 hr 30 minxplanation:   Speed upstream=2/2= 
<gadget id="calculator">2/2</gadget>
<output>1</output>
1 kn/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   Answer:2 hr 30 min
<result>E</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?