Question 1162431
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The solution is quick and easy, if a formal algebraic solution is not required.<br>
The difference in distances is 950 miles; the difference in speeds is 190mph.  That means the time was 950/190 = 5 hours.<br>
So the speed of the plane was 1200/5 = 240mph (and the speed of the car was 250/5 = 50mph).<br>