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Julia and Bianca both leave the college at the same time, but in opposite directions. If Bianca travels 9 mph faster than Julia and after 4 hours they are 140 miles apart, how fast is each traveling?

• math -

Let x = Julia's speed, then x+9 = Bianca's.

Time * Speed = Distance

4(x + x+9) = 140

Solve for x, then x+9.

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