Question 71577
A propeller driven plane leaves the airport and travels north at 200 mph. Two hours later, a jet plane leaves the same airport and travels north at 600 mph. How long will it take the jet plane to catch up to the propeller driven plane?
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Prop plane DATA:
Rate = 200 mph ; distance = x miles ; time = d/r = x/200 miles
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Jet plane DATA:
Rate = 600 mph ; distance = x miles ; time = d/r = x/600 miles

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EQUATION:
 jet time + 2 hr.  = plane time
x/600 + 2 = x/200
Multiply thru by 600 to get:
x + 1200 = 3x
2x=1200= 600 miles
Time for ject plane: 600/x = 600/600 = 1 hour.
Cheers,
Stan H.