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A man travels from P to Q at the speed of 60 km/h and travels from Q to P at the speed of 90 km/h. What is the average speed of the man for the whole journey?
एक आदमी 60 km/h की गति से P से Q की ओर यात्रा करता है और 90 km/h की गति से Q से P की ओर यात्रा करता है। पूरी यात्रा के लिए आदमी की औसत गति कया है?

A

a)75 km/h

B

b)78 km/h

C

c)70 km/h

D

d)72 km/h

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