Question 1148283
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The slower plane flies 2 hours at 400 mph before the faster plane takes off.<br>
(1) How far has the slower plane flown when the faster plane takes off?<br>
(2) The difference in speeds of the two planes is 100 mph.  So in each hour, the faster plane catches up to the slower by 100 miles.<br>
(3) Catching up at the rate in (2), how many hours does it take the faster plane to make up the distance in (1)?<br>