A man rows his boat 84 km downstream and 60 km upstream, taking 4 hours each time. Find the speed of the stream?
Answers:	A) 76 kmph	B) 6 kmph	C) 14 kmph	D) 8 kmph	E) 3 kmph
Speed downstream = d/t = 84/(4)= 
<gadget id="calculator">84/(4)</gadget>
<output>21</output>
21 kmph   Speed upstream= d/t = 60/(4)= 
<gadget id="calculator">60/(4)</gadget>
<output>15</output>
15 kmph   The speed of the stream= (21 - 15)/2= 
<gadget id="calculator">(21 - 15)/2</gadget>
<output>3</output>
3 kmph   Answer:3 kmph
<result>E</result>
A man rows his boat 84 km downstream and 60 km upstream, taking 4 hours each time. Find the speed of the stream?