Megan and Kate decided to race their bikes. If Megan can ride at 12 mph and Kate can ride at 16 mph, how long until they are 1 1/2 miles apart?

You would have to use an equation. The equation should be 12n+16n=1.5 When you found your answer, you should then use that decimal amount to "times" one hour to get the time. I am pretty sure that this is correct.