Erik's dog can run 24 miles per hour. It is chasing a rabbit that can run 15 miles per hour. The rabbit has a head start of .6 miles. How many minutes does it take for the dog to catch up to the rabbit?
The dog runs .4 miles per minute because 24 / 60 = 
<gadget id="calculator">24/60</gadget>
<output>2/5 = around 0.4</output>
.4.
The rabbit runs .25 miles per minute because 15 / 60 = 
<gadget id="calculator">15/60</gadget>
<output>1/4 = around 0.25</output>
.25.
We know that .4(Number of Minutes) = .25(Number of Minutes) + .6.
Therefore .15(Number of Minutes) = .6.
Therefore (Number of Minutes) = 4.

<result>4</result>