A boat running downstream covers a distance of 16 km in 4 hours while for covering the same distance upstream,it takes 8 hours.What is the speed of the boat in still water ?
Pick.
A) 3 km/hr	B) 6 km/hr	C) 8 km/hr	D) Data inadequate	E) None of these
Solution   Rate downstream =(16/4)= 
<gadget id="calculator">(16/4)</gadget>
<output>4</output>
4 kmph, Rate upstream=(16/8)= 
<gadget id="calculator">(16/8)</gadget>
<output>2</output>
2 kmph.   ∴ Speed in still water=1/2(4+2) kmph = 3 kmph.   3 km/hrnswer 3 km/hr
<result>A</result>
A boat running downstream covers a distance of 16 km in 4 hours while for covering the same distance upstream,it takes 8 hours.What is the speed of the boat in still water ?