Answer:
1497 - 202
Explanation:
The question is saying that the Las Vegas trip was longer so we know to put that first in the expression
we can also tell that the question is asking us for the difference (aka subtraction) between the two trip by the key words how much longer
and then it tells us that we are finding the difference between Las Vegas and Cheyenne so we know to use those two numbers
that is how we come up with the expression 1497 - 202