human
There is a road stretching 3 miles from the base camp to the chain challenge. Every 20 minutes, a car comes down the road from the base camp towards the chain challenge. How many hours have passed once 30 cars have come down the road?
assistant
How many minutes have passed? ** 20*30 = <<20*30=600>>600 minutes have passed.
How many hours have passed? ** 600/60 = <<600/60=10>>10 hours have passed.
#### 10