A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 15 minutes. How long will it take to go 5 km in stationary water? Options:
A) 40 minutes	B) 1 hour	C) 1 hour 15 min	D) 1 hour 30 min	E) 1 hour 40 min
speed (upstream) =2/1= 
<gadget id="calculator">2/1</gadget>
<output>2</output>
2 kmhr   speed (downstream)=1/(15/60)= 
<gadget id="calculator">1/(15/60)</gadget>
<output>4</output>
4 kmhr   speed in still water= 1/2 (2+4) = 3 kmhr   time taken in stationary = 5/3 = 1 hrs 40 min   ANSW1 hour 40 minR:1 hour 40 min
<result>E</result>
A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 15 minutes. How long will it take to go 5 km in stationary water?