The speed of a boat in upstream is 50 kmph and the speed of the boat downstream is 120 kmph. Find the speed of the boat in still water and the speed of the stream?
Choices.
A) 10 kmph
B) 76 kmph
C) 12 kmph
D) 35 kmph
E) 15 kmph
Speed of the boat in still water   = (50+120)/2   = 170 kmph. Speed of the stream   = (120-50)/2= 
<gadget id="calculator">(120-50)/2</gadget>
<output>35</output>
35 kmph.   Answer:35 kmph
<result>D</result>
The speed of a boat in upstream is 50 kmph and the speed of the boat downstream is 120 kmph. Find the speed of the boat in still water and the speed of the stream?