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schava_pavan · 27-01-08, 10:34 PM

4) the answer is :24 min.......
bcoz.. according to the calculation...dist/speed=time taken
during down stream.... dist= 2miles.. and speed: speed(man)+speed(stream)=Xm+Xs
and time taken is 2/3hrs.
and during up stream dist =2miles and speed :speed(man)-speed(stream)=Xm-Xs
and time taken is 1hr..
so solving we get Xm=2.5miles/hr.(persons speed in still water)..
hence by solving.. time taken=dist/speed (dist=1 mile; speed =2.5miles/hr)
time taken=1/2.5=2/5hr....or 24 minutes.......

27-01-08, 10:34 PM	#15 (permalink)
schava_pavan Junior Member Join Date: Jan 2008 Location: hyderabad Posts: 13 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 1	Re: Puzzle Contest-128 4) the answer is :24 min....... bcoz.. according to the calculation...dist/speed=time taken during down stream.... dist= 2miles.. and speed: speed(man)+speed(stream)=Xm+Xs and time taken is 2/3hrs. and during up stream dist =2miles and speed :speed(man)-speed(stream)=Xm-Xs and time taken is 1hr.. so solving we get Xm=2.5miles/hr.(persons speed in still water).. hence by solving.. time taken=dist/speed (dist=1 mile; speed =2.5miles/hr) time taken=1/2.5=2/5hr....or 24 minutes.......