The boat moves downside 100km and upside 20km in 2 hours each. Then find the boat speed in still water?	Pick.
A) 15km/hr	B) 25km/hr	C) 30km/hr	D) 20km/hr	E) 40km/hr
Down stream = 100/2= 
<gadget id="calculator">100/2</gadget>
<output>50</output>
50km/hr   Up stream= 20/2= 
<gadget id="calculator">20/2</gadget>
<output>10</output>
10km/hr   speed of boat in still water= 60/2= 
<gadget id="calculator">60/2</gadget>
<output>30</output>
30km/hr   Answer is 30km/hr
<result>C</result>
The boat moves downside 100km and upside 20km in 2 hours each. Then find the boat speed in still water?