Tina drove from Calgary to Vancouver, a distance of 1000 km, in 12.3 hours. She drove at

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Tina drove from Calgary to Vancouver, a distance of 1000 km, in 12.3 hours. She drove at 100 km/h on the “open road,” but slowed to 50 km/h on urban and curving roads.
What distance did she drive at each speed?
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