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Mathematics, 06.07.2019 19:30 oliviaclerk5

You and your friend are driving from nyc to philadelphia. there was terrible traffic leaving nyc so you drove 90 minutes at a constant rate of 40 mph. traffic improved, so suddenly you were able to travel the last part of the trip for 40 minutes at a constant rate of 60 mph. how long did it take for you and your friend to travel to philadelphia?

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