Amoving walkway at the airport moves at a pace of 1.8
feet per second. if you stand on the walkway as it moves, how long will it take to transport you 270
feet?

To answer this question, I'd make a ratio. Since feet depend on second, it'd be 1.8 ft. : 1 second. 

Then, divide 270 by 1.8 and then multiply the one second by the answer to get the amount of feet.

In this case, 270/1.8 = 150 * 1 second = 150 seconds it'd take to travel 270 feet.