<human>:  A plane travels 1200 miles in 3 hours. At the same rate, how many additional hours would it take to travel an additional 2000 miles?
<bot>: How fast is the plane travelling in mph? ** The rate is 1200/3=<<1200/3=400>>400 mph.
How many additional hours would it take to travel an additional 2000 miles? ** Then it would take 2000/400=<<2000/400=5>>5 hours more.
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