Answer
2000 miles
Work Step by Step
You are given the following:
Speed of aircraft = 400 miles per hour
$t$ = number of hours
400t = the distance traveled by the aircraft in $t$ hours
You are told to find the distance traveled by the aircraft in 5 hours. Therefore, $t=5$.
Since you have the expression for the distance traveled in $t$ hours, and you now have a value for $t$, you can plug in that value:
$400t=400(5)$
And solve:
$400\times5=2000$
And remember to include the unit, which in this case is miles.
