A boat running downstream cover a distance of 24km in 6 hr while covering the same distance upstream it takes 8 hr then the speed of the boat still in the water  Choose the most appropriate option.
A) 4.5km/hr  B) 9.5km/hr  C) 3.5km/hr  D) 25.6km/hr  E) 12.3km/hr
rate down stream=(24/6)= 
<gadget id="calculator">(24/6)</gadget>
<output>4</output>
4kmph   rate upstream=(24/8)= 
<gadget id="calculator">(24/8)</gadget>
<output>3</output>
3kmph   speed still water=1/2(4+3)kmph=3.5km/hr   Answer(3.5km/hr)
<result>C</result>
A boat running downstream cover a distance of 24km in 6 hr while covering the same distance upstream it takes 8 hr then the speed of the boat still in the water