Rory collects rainwater. He has 100 L of rainwater in his tank. During a heavy rainstorm, water flows into the tank at a rate of 2 L/min for 90 minutes. How much water is in the tank at the end of the heavy rain?
During the heavy rain, the tank collects 2 * 90 = <<2*90=180>>180 L of water
The tank has a total of 100 + 180 = <<100+180=280>>280 L of water
#### 280