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Physics, 13.10.2019 15:30 mariapowers490
a motorcyclist drives from a to b with the uniform speed of 30 km/h-1 and returns back with the speed of 20 km/h-1.find the average speed?
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a motorcyclist drives from a to b with the uniform speed of 30 km/h-1 and returns back with the spee...
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