Final answer:
To fill the swimming pool with a capacity of 80,000 L using a garden hose delivering 60 L/min, it would take approximately 22 hours and 13 minutes. If you could divert a moderate size river, flowing at 5000 m³/s into the pool, it would take approximately 44 minutes and 26 seconds.
Step-by-step explanation:
To find out how many gallons of water are used every 30 minutes in the surf pool, we need to calculate the number of waves generated in that time period and then multiply it by the amount of water used per wave. First, we need to calculate the number of waves in 30 minutes. Since waves are generated every 90 seconds, we divide 30 minutes by 90 seconds, which gives us 20 waves. Next, we multiply the number of waves by the amount of water used per wave: 20 waves x 303,200.0 liters/wave = 6,064,000 liters. Finally, we convert liters to gallons by multiplying the number of liters by 0.264172, since there are approximately 0.264172 gallons in 1 liter. So, 6,064,000 liters x 0.264172 gallons/liter = 1,602,035.648 gallons.