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problem:
A small airplane can fly 660 miles in 2 hours.
At this speed, how far could the airplane fly in 3 hours?
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answer:
1. step: proportion
: 2 hours – 660 miles
* 3 hours – x miles
2. step: which proportion?
↑hours ↑more miles = direct proportion
3. step: formula
x = 660 * 3
2
x = 990 miles
4. step: answer
It can fly 990 miles.