Faucet A flows at a rate of 100 liters per 5 minutes and Faucet B flows at a rate of 100 liters per 4 minutes into an empty pool. How many minutes do the two faucets take to fill a pool with 9,000 liters of water?
+37153 A rate = 100 l / 5 min = 20 l/min
B rate = 100/4 = 25 l/min combined = 45 liters per minute
9000 l / 45 l/ min = 200 min
