Distance algebra problem?
Guillermo is driving 40 miles per hour. After he has driven 30 miles, his brother Jorge starts driving in the same direction. At what rate must Jorge drive to catch up with Guillermo in 5 hours?
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Guillermo has a 30 mile headstart, and will travel a further 5×40=200 miles in the following 5 hours, for a total of 230 miles.
So, Jorge must travel 230 miles in 5 hours. Therefore he must travel at a rate of 230/5=46 miles per hour.