Answer
plane for 3 hours, car for 4 hours
Work Step by Step
plane: 1080 miles in x hours
car: 240 miles in $x+1$ hours
$1080/t = 6r$
$240/(t+1) = r$
$1080/t = 6*(240/(t+1))$
$1080/t = 1440/(t+1)$
$1440*t=1080(t+1)$
$1440t = 1080t + 1080$
$360t = 1080$
$360t/360 = 1080/360$
$t=3$
$t+1$
$3+1$
$4$
