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A man walks from point X to Y at a speed...

A man walks from point X to Y at a speed of 20 km/h, but comes back from point Y to X at a speed of 25 km/h. Find his average speed.
एक आदमी 20 किमी/घंटा की चाल से बिंदु A से Y तक जाता है, लेकिन 25 किमी/घंटा की चाल से बिंदु Y से X तक वापस आता है। उसकी औसत चाल ज्ञात कीजिए।

A

`22 2/9`

B

`23 2/9`

C

`25 2/9`

D

`24 2/9`

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