Three pumps working 8 hours a day can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day.
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Assuming that all pumps involved have the same pumping rate:
3 pumps, 8 hours / day, 2 days to empty tank.
3 x 8 x 2 = 48 hours of pumping for a single pump to empty the tank.
48 pumping hours / 4 pumps = 12 hours to empty the tank
3 pumps, 8 hours / day, 2 days to empty tank.
3 x 8 x 2 = 48 hours of pumping for a single pump to empty the tank.
48 pumping hours / 4 pumps = 12 hours to empty the tank
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