If a boat goes 4km upstream in 12 minutes and the speed of the stream is 8 kmph, then the speed of the boat in still water is ?
Choose the correct answer.
A) 28  B) 29  C) 30  D) 31  E) 32
Rate upsteram =(4/12*60)= 
<gadget id="calculator">(4/12*60)</gadget>
<output>20</output>
20kmph.   speed of the stream=8kmph let speed in still water be xkm/hr. then speed upstream=(x-8)km/hr. x-8=20==&gt;x=28km/hr 28nswer(28)
<result>A</result>
If a boat goes 4km upstream in 12 minutes and the speed of the stream is 8 kmph, then the speed of the boat in still water is ?