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1. 2 large and 1 small pumps can fill a water tank in 4 hours. One large and 3 small pumps can also fill the same water tank in 4 hours. how many hours will it take for 3 large and 4 small pumps to fill the tank?

  • A. 2 hours
  • B. 2 hours
  • C. 2 hours
  • D. 2 hours

Answer: Option A

Explanation:

Here, 2 large and 1 small pumps ≡ 1 large and 3 small pumps

Again, 3 large and 4 small pumps

=  2 large and 1 small pumps +  1 large and 3 small pumps

=  2 large and 1 small pumps +  2 large and 1 small pumps

= 2 x (2 large and 1 small pumps)

Now, 2 large and 1 small pumps can fill the tank in 4 hours

So, 2 x (2 large and 1 small pumps) can fill the tank = 4/2 = 2 hours

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