Two jets leave an airport at the same time, flying in opposite directions. the first jet is traveling at three hundred seventy-seven mph and the other at two hundred seventy-five mph. how long will it take for the jets to be 9128 miles apart?

Remember that distance equals speed times time: . We know for our problem that the speed of our first jet is 377 mph, so . We also know the speed of our second one is 275 mph, so . Since the the time that will it take for the jets to be 9128 miles apart is the same,  is going to be equal for both jets. Now we can setup our distance equations for both jets.
For our first jet:

For our second jet:


We know for our problem that after  the jets will be 9128 miles apart, so the total distance will be 9128: . Since our jets are traveling in opposite directions, the distance between them will increase over time, so we are going to add  and , and set them equal to  to find our time:






We can conclude that our jets will be 9128 miles apart after 14 hours.

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