A man rows his boat 110 km downstream and 90 km upstream, taking 3 hours each time. Find the speed of the stream?  Choose the correct choice from the following options:	A) 6	B) 5	C) 7.5	D) 3.5	E) 2.5
Speed downstream = d/t = 110/(3) = 37 kmph   Speed upstream = d/t = 90/(3)= 
<gadget id="calculator">90/(3)</gadget>
<output>30</output>
30 kmph   The speed of the stream= (37 - 30)/2= 
<gadget id="calculator">(37 - 30)/2</gadget>
<output>7/2 = around 3.5</output>
3.5 kmph   Answer:3.5
<result>D</result>
A man rows his boat 110 km downstream and 90 km upstream, taking 3 hours each time. Find the speed of the stream?