If a boat goes 6km upstream in 36 minutes and the speed of the stream is 4 kmph, then the speed of the boat in still water is ?  Choose one.
A) 10 B) 11 C) 12 D) 13 E) 14
Rate upsteram =(6/36*60)= 
<gadget id="calculator">(6/36*60)</gadget>
<output>10</output>
10kmph.   speed of the stream=4kmph let speed in still water be xkm/hr. then speed upstream=(x-4)km/hr. x-4=10==&gt;x=14km/hr Answer(14)
<result>E</result>
If a boat goes 6km upstream in 36 minutes and the speed of the stream is 4 kmph, then the speed of the boat in still water is ?