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A man can row 15 km per hour downstream ...

A man can row 15 km per hour downstream and 9 km per hour upstream. The speed (in km/hour) of the boat in still water is-
एक व्यक्ति अधोप्रवाह में 15 किमी/घंटा की गति से और ऊर्ध्वप्रवाह में 9 किमी/घंटा को दर से नाव चला सकता है। स्थिर जल में नाव की गति (किमी/घंटा में) कितनी होगी?

A

15

B

8

C

10

D

12

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