Multiple choice

To go from place A to B, a boat takes 40% more time than returning from B to A. Speed of boat is how much percent more than speed of the current? स्थान A से B तक जाने में एक नाव स्थान B से A तक आने में लगने वाले समय से 40% अधिक समय लेती है । नाव की चाल धारा की चाल से कितने प्रतिशत अधिक है।

  1. 600%

  2. 500%

  3. 400%

  4. 300%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let downstream time be T. Upstream time is 1.4T (40% more). Speed ratio = distance/time ratio = 1/1.4T : 1/T. Boat speed = (downstream + upstream)/2, current = (downstream - upstream)/2. This gives boat speed 500% more than current.

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