If a boat goes 8km upstream in 80 minutes and the speed of the stream is 5 kmph, then the speed of the boat in still water is ?	Choose the most appropriate option
A) 8	B) 9	C) 10	D) 11	E) 12
Rate upsteram =(8/80*60)= 
<gadget id="calculator">(8/80*60)</gadget>
<output>6</output>
6kmph.   speed of the stream=5kmph let speed in still water be xkm/hr. then speed upstream=(x-5)km/hr. x-5=6==&gt;x=11km/hr Answer(11)
<result>D</result>
If a boat goes 8km upstream in 80 minutes and the speed of the stream is 5 kmph, then the speed of the boat in still water is ?