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Mathematics, 12.10.2019 03:30 mrsqueenbabe516

It took mary 1.5 hours to bicycle 39km. then she slowed down and took another 3 hours to bicycle 51 km more. find her average speed for the trip.
(total 8 points; 4 points for the answer, 2 points for the units labeled and 2 points for work shown or explanation)

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It took mary 1.5 hours to bicycle 39km. then she slowed down and took another 3 hours to bicycle 51...

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