Answer
666.67 miles
Work Step by Step
jet: distance = 500*t
propeller: distance = 200*(t+2)
$500*t=200*(t+2)$
$500t=200t+400$
$300t = 400$
$300t/300 = 400/300$
$t = 4/3$
$200*(t+2)=d$
$200*(4/3+2)=d$
$200*10/3=d$
$2000/3=d$
$d=666.67$