A man rows his boat 120 km downstream and 92 km upstream, taking 4 hours each time. Find the speed of the stream?
Choose the correct choice from the following answers:
A) 6 kmph B) 4 kmph C) 2 kmph D) 8 kmph E) 1 kmph
Speed downstream = d/t = 120/(4)= 
<gadget id="calculator">120/(4)</gadget>
<output>30</output>
30 kmph   Speed upstream= d/t = 92/(4)= 
<gadget id="calculator">92/(4)</gadget>
<output>23</output>
23 kmph   The speed of the stream= (30 - 23)/2 = 4 kmph   Answer:4 kmph
<result>B</result>
A man rows his boat 120 km downstream and 92 km upstream, taking 4 hours each time. Find the speed of the stream?