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Question

Two large and 1 small pumps can fill a swimming pool in 4 hours. One large and 3 small pumps can also fill the same swimming pool in 4 hours. How many hours will it take 4 large and 4 small pumps to fill the swimming pool.(I assume that all large pumps are similar and all small pumps are also similar.)

Answer 1

1 large = 2 small  (let an expert student verify)

 

2.5 large take 4 hours.

6 large would take 1 hour 40 minutes