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? Pick:	A) 40 minutes	B) 1 hour	C) 1 hour 15 min	D) 1 hour 30 min	E) none
Solution   Rate downstream	= (1 / 10 x 60)km/hr   = 6 km / hr.   Rate upstream	= 2 km/hr.   Speed in still water	= 1 / 2(6 + 2)km/hr   = 4 km.   Required time	= (5 / 4) km/hr   = 1x 1/4 km/hr   = 1 hr 15 min.   Answer 1 hour 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?