A boat with surface speed of 15 kmph takes I hour to reach its destination downstream but it takes 2 hours to cover the return journey upstream. What is thedistance between the destination and the origin?
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let the speed of water be x snd distance be D,
so , atq
(15 + x)×1 = d -----------1
and
(15 - x)×2 = d -----------2
add 1×2 + 2
60 = 3d
d = 20 km
hope it helps ^_^
rebelmallu:
can u plz tell any way to study this type of problems?
is there any app or sites
I don't think so but you can check Socratic and doubtnut (for maths) , or just simply type your question in google
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