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 choices:  A) 40 minutes  B) 1 hour  C) 1 hour 15 min  D) 1 hour 30 min  E) 1 hour 10 min
speed (upstream) =2/1= 
<gadget id="calculator">2/1</gadget>
<output>2</output>
2 kmhr   speed (downstream)=1/(10/60)= 
<gadget id="calculator">1/(10/60)</gadget>
<output>6</output>
6 kmhr   speed in still water= 1/2 (2+6) = 4 kmhr   time taken in stationary = 5/4 = 1 hrs 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?