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?	Choose the correct choice from the following answers
A) 40 minutes	B) 1 hour	C) 1 hr 15 min	D) 1 hr 30 min	E) 1 hr 40 min
2km in 1hr=2km/hr   1 km in 10 minutes means [1/10]*60=6km/hr   speed in still water is 1/10 *60= 
<gadget id="calculator"> 1/10 *60</gadget>
<output>6</output>
6km/hr   speed in still water is=1/2(6+2)=4km/hr   Required time=[5/4]hrs means 1hr 15 minutes   ANSWER:1 hr 15 min
<result>C</result>
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?