Chapter 11 - Rational Expressions and Functions - 11-6 Inverse Variation - Practice and Problem-Solving Exercises - Page 702: 16

$S=13\frac{1}{3} mph$

$T=\frac{k}{S}$ where T is time and S is speed. (Calculate for k) $2=\frac{k}{10}$ (Multiply both sides by 10) k=20 (Plug k back into the original equation) $1.5=\frac{20}{S}$ (Multiply each side by S) $1.5S=20$ (Divide each side by 1.5) $S=13\frac{1}{3}$