Jim is a paratrooper who has to land on a moving aircraft carrier. If his plane is flying with 90 miles per hour, he will be an hour early for the intercross. If his plane travels at a speed of 80 miles per hour, he will be an hour late for landing on the ship. How long is Jim’s scheduled flight-time?

Question

Reiny · Answer

let the distance be d miles time at 90 mph = d/90 time at 80 mph = d/80 d/80 - d/90 = 1 times 720 9d - 8d = 720 d = 720 miles

Steve · Answer

good answer, but it does not address the question.

Jijnjo · Answer

an hour early and an hour late means there are two hours inbetween, so: d/80 - d/90 = 2 times 720 9d - 8d = 1440 d = 1440 miles and takes 17 hours