Chapter 11 - Rational Expressions and Functions - 11-4 Adding and Subtracting Rational Expressions - Practice and Problem-Solving Exercises - Page 676: 43

$2500/(r+100) + 2500/r$ $(5000r + 250000)/r(r+100)$

LA to NY: rate = $r+100$ NY to LA: rate = $r$ $(r+100)*t = 2500$ $t = 2500/(r+100)$ $r*t = 2500$ $t = 2500/r$ $2500/(r+100) + 2500/r$ $2500/(r+100)*r/r + 2500/r*(r+100)/(r+100)$ $2500r/r(r+100) + 2500(r+100)/r*(r+100)$ $2500r + 2500r + 250000 / r(r+100)$ $5000r + 250000/r(r+100)$