A boat ma goes 2km against the current of the stream in 1 hr and goes 1 km along the current in 10 min. how long will it take to go 12 km in stationary water Choose the correct choice from the following answers:
A) 40 min B) 3hr C) 1hr 15 min D) 1hr 30 min E) 4 hr
rate down stream=(1/10*60)km/hr=6km/hr   rate up stream=2km/hr   speed still water =1/2(6+2)=4km/hr   required time =(12/4)= 
<gadget id="calculator">(12/4)</gadget>
<output>3</output>
3 Hr   Answer(3hr)
<result>B</result>
A boat ma goes 2km against the current of the stream in 1 hr and goes 1 km along the current in 10 min. how long will it take to go 12 km in stationary water