If a boat goes 5km upstream in 25 minutes and the speed of the stream is 7 kmph, then the speed of the boat in still water is ?  Select the correct option:
A) 18  B) 19  C) 20  D) 21  E) 22
Rate upsteram =(5/25*60)= 
<gadget id="calculator">(5/25*60)</gadget>
<output>12</output>
12kmph.   speed of the stream=7kmph let speed in still water be xkm/hr. then speed upstream=(x-7)km/hr. x-7=12==&gt;x=19km/hr Answer(19)
<result>B</result>
If a boat goes 5km upstream in 25 minutes and the speed of the stream is 7 kmph, then the speed of the boat in still water is ?