Hello overflow

Welcome to Math Help Forum!Suppose Erika runs at mph. Then Andy rides at mph. Using the formulawe find that, to cover the miles, Erika takes hours, and Andy takes hours. Since Erika's time is hour more than Andy's we can say

The easiest way to handle an equation like this is to get rid of fractions as soon as possible. So we multiply both sides by , and get

So Erika runs at mph.

, since cannot be negative.

Grandad