Multiple choice

A boat covers 12 km upstream in 4 hours and can cover the same distance downstream in 3 hours. What is the speed (in km/hr) of the boat in still water? एक नाव 4 घंटे में 12 किमी ऊर्ध्वप्रवाह तय करती है और 3 घंटे में समान दूरी अनुप्रवाह तय करती है। शांत जल में नाव की गति (किमी/घंटा में) क्या है?

  1. 3.5

  2. 3

  3. 2.5

  4. 4
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A Correct answer
Explanation

Upstream speed = 12/4 = 3 km/hr. Downstream speed = 12/3 = 4 km/hr. Speed in still water = (upstream speed + downstream speed)/2 = (3+4)/2 = 3.5 km/hr.

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