A man rows his boat 84 km downstream and 48 km upstream, taking 2 hours each time. Find the speed of the stream? Pick one:
A) 6 kmph
B) 5 kmph
C) 9 kmph
D) 8 kmph
E) 1 kmph
Speed downstream = d/t = 84/(2)= 
<gadget id="calculator">84/(2)</gadget>
<output>42</output>
42 kmph   Speed upstream= d/t = 48/(2)= 
<gadget id="calculator">48/(2)</gadget>
<output>24</output>
24 kmph   The speed of the stream= (42 - 24)/2= 
<gadget id="calculator">(42 - 24)/2</gadget>
<output>9</output>
9 kmph   Answer:9 kmph
<result>C</result>
A man rows his boat 84 km downstream and 48 km upstream, taking 2 hours each time. Find the speed of the stream?