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A person travels on a cycle from home to church on a
straight road with wind against him. He took 4 hours to
reach there.
On the way back to the home, he took 3 hours to reach as
wind was in the same direction.
If there is no wind, how much time does he take to travel
from home to church?
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Let distance between home and church is D.
A person took 4 hours to reach church. So speed while
travelling towards church is D/4.
Similarly, he took 3 hours to reach home. So speed while
coming back is D/3.
There is a speed difference of 7*D/12, which is the wind
helping person in 1 direction, & slowing him in the other
direction. Average the 2 speeds, & you have the speed that
person can travel in no wind, which is 7*D/24.
Hence, person will take D / (7*D/24) hours to travel
distance D which is 24/7 hours.
Answer is 3 hours 25 minutes 42 seconds
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