Answer / guest

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

Answer / kishore

if there is no wind how could he breathe.

Answer / parthi

3 hours 30 min

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