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A man goes from C to D at 40 km/h and he...

A man goes from C to D at 40 km/h and he returns from D to C at x km/h. If the average speed of the man for the whole journey is 60 km/h, then what is the value of x?
एक आदमी 40 km/h की गति से C से D तक जाता है और वह X km/h की गति से D से C पर लौटता है। यदि पूरी यात्रा के लिए आदमी की औसत गति 60 km/h है, तो x का मान क्या है?

A

100

B

120

C

110

D

80

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