If a boat goes 7km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is ?
Select.
A) 13km/hr	B) 52km/hr	C) 85km/hr	D) 2.8km/hr	E) 5.98km/hr
Rate upsteram =(7/42*60)= 
<gadget id="calculator">(7/42*60)</gadget>
<output>10</output>
10kmph.   speed of the stream=3kmph let speed in still water be xkm/hr. then speed upstream=(x-3)km/hr. x-3=10==&gt;x=13km/hr 13km/hrnswer(13km/hr)
<result>A</result>
If a boat goes 7km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is ?