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A boat can go 5km upstream and 7 1/2km d...

A boat can go 5km upstream and `7 1/2`km downstream in 45 minutes. It can also go 5km downstream and 2.5km upstream in 25minutes. How much time (in minutes) will it take to go 6 km upstream ?
एक नाव 5 किमी ऊर्ध्वप्रवाह और `7 1/2` किमी अनुप्रवाह 45 मिनट में जा सकती है। वह 25 मिनट में 5 किमी अनुप्रवाह और 2.5 किमी ऊर्ध्वप्रवाह पर भी जा सकती है। 6 किमी ऊर्ध्वप्रवाह जाने में कितना समय (मिनटों में) लगेगा ?

A

30

B

24

C

36

D

32

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