Water needs to be removed from an underground chamber before work can commence.

Water needs to be removed from an underground chamber before work can commence. When the water was at a depth of 3m, five suction pipes were used and emptied the chamber in 4 hours. If the water is now at a depth of 5m (same cross- section), and you want to empty the chamber in 10 hours time, how many pipes need to be used?

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