SAT Math: Using Rates to Calculate Total Time

Two chemistry students, Mike and Mona, are each adding base to the same beaker of acid in order to neutralize it. Mike adds the base at a rate of 0.35 milliliters per second, and Mona adds it at a rate of 0.22 milliliters per second. If their teacher suggests that they proceed carefully after 5 milliliters have been added, after how much time t in seconds should they begin to proceed carefully? Round to the nearest tenth place.

Heart of AlgebraLinear inequalities in one variable (word problems)
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SAT MathAlgebra and Functions
Heart of Algebra
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