OpenStax, Elementary Algebra 2e §5.4 Solve Applications with Systems of Equations · Example 8 · Algebra · Systems
Solve Applications with Systems of Equations · Example 8
Translate to a system of equations and then solve:
Joni left St. Louis on the interstate, driving west towards Denver at a speed of 65 miles per hour. Half an hour later, Kelly left St. Louis on the same route as Joni, driving 78 miles per hour. How long will it take Kelly to catch up to Joni?
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Elementary Algebra 2e · §5.4 Solve Applications with Systems of Equations · Example 8
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