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The speed of a boat in still water is 15...

The speed of a boat in still water is 15 km/h, and the speed of the current is 5 km/h, in how much time (in hours) will the boat travel a distance of 60 km upstream and the same distance downstream?
स्थिर नदी में एक नाव की चाल 15 km/h और धारा की चाल 5 km/h है। नाव 60 किलोमीटर की दुरी धारा के साथ और उतनी ही दुरी धारा के विपरीत कितने समय (घंटे में ) में तय करेगी

A

12

B

9

C

10

D

20

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