SOLUTION: A car traveling at a rate of 30 km/h left Gander. A second car left Gander 1 hour later. At what rate must the second car travel to catch up with the first in 3 hours?

Question 280061: A car traveling at a rate of 30 km/h left Gander. A second car left Gander 1 hour later. At what rate
must the second car travel to catch up with the first in 3 hours?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Start a stopwatch when the 2nd car leaves Gander
When I start the stopwatch, the 1st car has a
mile head start
When I stop the stopwatch, they both will have
driven for the same time, which is hrs
1st car:

mi
2nd car:

mi
and

The 2nd car must drive 40 mi/hr to catch the 1st car
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