Question

Amanda starts the music city marathon at 6:00 am the marathon is 42 kilometers long if she runs 6 kilometers an hour what time will she finish the marathon

Answer 1

7 hours later.
If her rate is
6km/hour 
then if we do some simple math
6/1=42/7
In 7 hours Amanda will b finished with the marathon

Answer 2

42/6=7
It'll take her 7hrs to finish
So from 6am+7hrs

It'll be 1:00pm when she finishes the marathon