A water tank contains 12500L water. The tap is left on and the tank loses 135L per minute. The tap is turned off when the tank has 5000L of water left. Determine how long the tap was left on to the nearest minute.
To find the time it takes for the tank to go from 12500L to 5000L, we need to subtract the final amount from the initial amount and divide by the rate of loss.
12500L - 5000L = 7500L
7500L / 135L/min ≈ 55.56 min
Therefore, the tap was left on for approximately 56 minutes.