If a boat goes 9km upstream in 108 minutes and the speed of the stream is 2 kmph, then the speed of the boat in still water is ?
Choose the correct choice from the following options:
A) 5
B) 6
C) 7
D) 8
E) 9
Rate upsteram =(9/108*60)= 
<gadget id="calculator">(9/108*60)</gadget>
<output>5</output>
5kmph.   speed of the stream=2kmph let speed in still water be xkm/hr. then speed upstream=(x-2)km/hr. x-2=5==&gt;x=7km/hr Answer(7)
<result>C</result>
If a boat goes 9km upstream in 108 minutes and the speed of the stream is 2 kmph, then the speed of the boat in still water is ?