Martina's inground swimming pool is finally finished, and all that's left to do is fill it with water. Martina's family decides to fill their pool using their garden hose to save money, even though they know it will take a really long time. The swimming pool is 10 meters long and 5 meters wide, and Martina's family wants the water to be 2 meters deep. Water from the garden hose flows at a rate of 2,500 liters, or 2.5 cubic meters, per hour.

How long will it take to fill the pool?
Write your answer as a whole number or decimal. Do not round.

First, we need to calculate the volume of the pool. The formula for calculating the volume of a rectangular prism (such as a swimming pool) is length x width x height.

Volume = 10m x 5m x 2m = 100 cubic meters

Next, we need to calculate how many hours it will take to fill the pool at a rate of 2.5 cubic meters per hour.

Time = Volume / Flow rate
Time = 100 cubic meters / 2.5 cubic meters per hour
Time = 40 hours

So, it will take Martina's family 40 hours to fill their swimming pool using the garden hose.