math
posted by RNRH .
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 295mile trip. How fast did she travel during the dust storm?

dust storm rate  x mph
clear day rate  x+40 mph
solve
3(x) + 4(x+40) = 295