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Janet took 3h to drive from town a to town b at an average speed of 100km/h. she rested for 30 minutes and traveled to town c at an average speed of 70km/h for the remaining 2h. find janet's average speed for the whole journey.

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Janet took 3h to drive from town a to town b at an average speed of 100km/h. she rested for 30 minut...

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