A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?  Options
A) 6 kmph B) 9 kmph C) 3 kmph D) 8 kmph E) 1 kmph
Speed downstream = d/t = 85/(2 1/2)   = 34 kmph   Speed upstream = d/t = 45/(2 1/2)   = 18 kmph   The speed of the stream = (34 - 18)/2= 
<gadget id="calculator">(34 - 18)/2</gadget>
<output>8</output>
8 kmph   Answer:8 kmph
<result>D</result>
A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?