Two cars leave San Francisco and Santa Cruz respectively (say 70 miles apart). They travel toward each other a?

Two cars leave San Francisco and Santa Cruz respectively (say 70 miles apart). They travel toward each other at rates of 40 mph and 30 mph. A hummingbird flying at the rate of 70 mph starts out just as the faster car departs and flies to the slower car. It keeps flying back and forth between the cars until the cars... show more Two cars leave San Francisco and Santa Cruz respectively (say 70 miles apart). They travel toward each other at rates of 40 mph and 30 mph. A hummingbird flying at the rate of 70 mph starts out just as the faster car departs and flies to the slower car. It keeps flying back and forth between the cars until the cars meet. How far does the tired hummingbird fly?
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