Two pumps are filling a pool. The first pump is filling the pool 330 liters hourly, while the second pump is filling quarter of the pool in 4 hours. How many hours would it take the two pumps to fill in the pool full together, if the pool's capacity is 1760 litres?
+36916 1/4 of the pool per 4 hours hour is 1/4 * 1760 l/ 4hr = 110 l/hr
110 + 330 = 440 L/HR
1760 L / 440 L/HR = 4 hours
