Human: Marcy keeps a 2-liter bottle of water by her desk. She takes a sip every five minutes, and each sip is 40 ml. How many minutes does it take her to drink the whole bottle of water? Assistant: 
How many milliliters are in the bottle? ** First find the total number of milliliters in the bottle: 2 liters * 1000 ml/liter = <<2*1000=2000>>2000 ml
How many sips does Marcy take? ** Then divide the total number of milliliters by the amount she drinks per sip: 2000 ml / 40 ml = <<2000/40=50>>50 sips
How many minutes does it take her to drink the whole bottle of water? ** Then multiply the number of sips by the time per sip to find the time it takes her to drink the bottle: 50 sips * 5 minutes/sip = <<50*5=250>>250 minutes
#### 250