Flying at 400 miles per hour, approximately how long will it take for a plane to travel between two cities that are 2,600 miles apart?


\(R \times T=D\)

The formula stands for Rate multiplied by Time equals Distance. Plug in the numbers from the problem we have \(400 \times ?=2,600\)

If T were 4 hours, the distance would be \(4 \times 400=1,600\) We need a larger T if we want the distance to be 2,600. If T were 5 hours, \(5 \times 400=2,000\). That's still not large enough. If T were 6 hours, \(6 \times 400=2,400\). If T were 7 hours, \(7 \times 400=2,800\). Notice that 2,600 is between 2,400 and 2,800. Therefore, the correct time must be between 6 and 7 hours.  

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