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A boat covers 64 km upstream in 8 hours ...

A boat covers 64 km upstream in 8 hours and 120 km downstream in 12 hours. What is the speed (in m/s) of the boat in still water?
एक नाव धारा के प्रतिकूल 8 घंटे में 64 किमी तथा धारा के अनुकूल 12 घंटे में 1210 किमी की दूरी तय कर सकती है | स्थिर जल में नाव की चाल ( मीटर/सेकंड में ) क्या होगी ?

A

2.5

B

2

C

3.5

D

3

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