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5 pipes with the same water flow rate fill a cistern in 720 seconds. to fill the cistern in 1200 secs the number of pipes used is?

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5 pipes with the same water flow rate fill a cistern in 720 seconds. to fill the cistern in 1200 secs the number of pipes used is?​

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Another question on Mathematics

5 pipes with the same water flow rate fill a cistern in 720 seconds. to fill the cistern in 1200 secs the number of pipes used is?