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Lauren drove her car for 3 hours in a dust storm. When the skies cleared, she increased her speed by 30 miles per hour and drove 4 more hours, completing her 295-mile trip. How fast did she travel during the dust storm?

1 answer

dust storm rate ---- x mph
clear day rate ----- x+40 mph

solve

3(x) + 4(x+40) = 295

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