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