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? Give me reasons, before answering the question
During the heavy rain, the tank collects 2 * 90 = 180 L of water. The tank has a total of 100 + 180 = 280 L of water. So the final answer is 280.