1Slowbow
05.10.2019 •
Mathematics
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
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Ответ:
average speed = (39 + 51) / (1.5 + 3)
= 90 / 4.5
= 20 km per hr <==
Ответ:
b
Step-by-step explanation: