Question 1158562
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In the hour that Billy drove at 45mph before Kendall started, Billy drove 45 miles.<br>
Once Kendall started driving at 60mph, the rate at which he caught up to Billy was 60-45 = 15mph.<br>
To make up the 45 miles at a rate of 15 miles per hour will take 45/15 = 3 hours.<br>
If you need an algebraic solution....<br>
When Kendall caught up to Billy, Kendall had driven x hours at 60mph and Billy had driven (x+1) hours at 45mph:<br>
{{{60(x) = 45(x+1)}}}<br>
Solve using basic algebra.<br>