The speed of a boat in upstream is 45 kmph and the speed of the boat downstream is 90 kmph. Find the speed of the boat in still water and the speed of the stream?	Choices
A) 70,10 kmph
B) 67.5,22.5 kmph
C) 70.5,70.5 kmph
D) 78.6,10.25 kmph
E) 70,12 kmph
Speed of the boat in still water   = (45+90)/2= 
<gadget id="calculator">(45+90)/2</gadget>
<output>135/2 = around 67.5</output>
67.5 kmph. Speed of the stream= (90-45)/2= 
<gadget id="calculator">(90-45)/2</gadget>
<output>45/2 = around 22.5</output>
22.5 kmph.   Answer:67.5,22.5 kmph
<result>B</result>
The speed of a boat in upstream is 45 kmph and the speed of the boat downstream is 90 kmph. Find the speed of the boat in still water and the speed of the stream?