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Mathematics, 01.07.2019 01:30 aaliyahettorre

Atrain goes from new orleans to boston at 40 mph. on the way back it returns with a speed of 80 mph. if it takes it an hour less time to return, what is its average speed?

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Atrain goes from new orleans to boston at 40 mph. on the way back it returns with a speed of 80 mph....
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