The speed of a boat in upstream is 85 kmph and the speed of the boat downstream is 185 kmph. Find the speed of the boat in still water and the speed of the stream? Choose the correct choice from the following:
A) 10	B) 99	C) 77	D) 50	E) 22
Speed of the boat in still water = (85+185)/2= 
<gadget id="calculator">(85+185)/2</gadget>
<output>135</output>
135 kmph. Speed of the stream= (185-85)/2= 
<gadget id="calculator">(185-85)/2</gadget>
<output>50</output>
50 kmph.   Answer: 50
<result>D</result>
The speed of a boat in upstream is 85 kmph and the speed of the boat downstream is 185 kmph. Find the speed of the boat in still water and the speed of the stream?