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A person travels 75 km at a speed of 25 km/h, next 60 km at a speed of 20 km/h and the last 90 km at a speed of 15 km/h. His average speed is :
एक व्यक्ति 75 km की यात्रा 25 km/h की गति से, अगली 60 km की यात्रा 20 km/h की गति से और उसके बाद 90 km की यात्रा 15 km/h की गति से तय करता है | उसकी औसत गति है:

A

25.5 km/h

B

18.75 km/h

C

20.25 km/h

D

15 km/h

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