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Mathematics, 24.09.2019 21:00 corvo556

John drove the first 195 miles of a car trip in 3 hours at a constant rate. because of heavy traffic, his rate slows by 30 mph. what is john's new, slower rate of travel?
can someone tell me why every answer to the question requires plus now? also the the actually one to.

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John drove the first 195 miles of a car trip in 3 hours at a constant rate. because of heavy traffic...
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