conversations.from: human
conversations.value: Hannah needs to drink 100 ml of water for every 200 calories she burns. She spends 2 hours doing aerobics, which burns 500 calories/hour, and 1 hour running, which burns 600 calories/hour. How many ml of water does she need to drink?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: First find the total calories burned on aerobics: 2 hours * 500 calories/hour = 1000 calories
  Then add the calories burned running to find the total calories burned: 600 calories + 1000 calories = 1600 calories
  Finally, divide that number by the ratio of calories burned to water drunk to find how many water Hannah needs to drink: 1600 calories * 100 ml/200 calories = 800 ml