Multiple choice

A boat can cover upstream 24 km. in 6 hours and returns downstream 20 km. in 4 hours. Then find the speed of boat in still water? एक नाव धारा की विपरीत दिशा में 24 किमी. 6 घण्टा में और धारा की दिशा में 20 किमी. 4 घण्टा में चलता है तो नाव की चाल स्थिर जल में बताइये?

  1. 4.5 km./hr./किमी./घं.

  2. 4 km./hr./किमी./घं.

  3. 3.5 km./hr./किमी./घं.

  4. 3 km./hr./किमी./घं.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Upstream speed = 24/6 = 4 km/hr. Downstream speed = 20/4 = 5 km/hr. Speed of boat in still water = (upstream + downstream)/2 = (4+5)/2 = 4.5 km/hr. Option A is correct.

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