A man rows his boat 70 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?	Choose the correct option.
A) 1 kmph  B) 6 kmph  C) 5 kmph  D) 8 kmph  E) 7 kmph
Speed downstream = d/t = 75/(2 1/2) = 28 kmph   Speed upstream = d/t = 45/(2 1/2) = 18 kmph   The speed of the stream = (28 - 18)/2= 
<gadget id="calculator">(28 - 18)/2</gadget>
<output>5</output>
5 kmph   Answer:5 kmph
<result>C</result>
A man rows his boat 70 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?