A man rows his boat 78 km downstream and 50 km upstream, taking 2 hours each time. Find the speed of the stream?  Choose the correct choice from the following options
A) 76 kmph	B) 6 kmph	C) 14 kmph	D) 7 kmph	E) 4 kmph
Speed downstream = d/t = 78/(2)= 
<gadget id="calculator">78/(2)</gadget>
<output>39</output>
39 kmph   Speed upstream= d/t = 50/(2)= 
<gadget id="calculator">50/(2)</gadget>
<output>25</output>
25 kmph   The speed of the stream= (39 - 25)/2= 
<gadget id="calculator">(39 - 25)/2</gadget>
<output>7</output>
7 kmph   Answer:7 kmph
<result>D</result>
A man rows his boat 78 km downstream and 50 km upstream, taking 2 hours each time. Find the speed of the stream?