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From Post No.1600
Airplane A takes off from Miami at 200 mph
Airplane B takes off from Miami one hour later at 300 mph
How long will it take B to catch up with A, and how far from Miami?
Solution:
Plane A will be 200 miles from Miami when plane B takes off.
The difference in their speeds is 100 mph
So although plane B is flying at 300 mph, it will be closing with plane A at
only 100 mph, so it will take plane B two hours to catch up.
Meanwhile, plane A will have traveled another 400 miles in those two hours.
The planes will rendezvous 600 miles from Miami.
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