A man rows his boat 90 km downstream and 55 km upstream, taking 3 hours each time. Find the speed of the stream?	Select.
A) 76 kmph	B) 6 kmph	C) 14 kmph	D) 8 kmph	E) 4 kmph
Speed downstream = d/t = 90/(3)= 
<gadget id="calculator">90/(3)</gadget>
<output>30</output>
30 kmph   Speed upstream= d/t = 55/(3)   = 18 kmph   The speed of the stream = (30 - 18)/2= 
<gadget id="calculator">(30 - 18)/2</gadget>
<output>6</output>
6 kmph   Answer:6 kmph
<result>B</result>
A man rows his boat 90 km downstream and 55 km upstream, taking 3 hours each time. Find the speed of the stream?