Two horses begin running on an oval course at the same time. One runs each lap in 8 minutes; the other takes 12 minutes to run each lap. How Many minutes after the start will the faster horse have a one lap lead?	Choose the most appropriate option.
A) 24	B) 12	C) 9	D) 4	E) 3
The rate of the faster horse is 1/8 lap/minute;   The rate of the slower horse is 1/12 lap/minute;   Their relative rate is 1/8-1/12=1/24 lap/minute;   The faster horse to gain one full lap will need time=distance/rate=1/(1/24)= 
<gadget id="calculator">1/(1/24)</gadget>
<output>24</output>
24 minutes.   24nswer: 24.
<result>A</result>
Two horses begin running on an oval course at the same time. One runs each lap in 8 minutes; the other takes 12 minutes to run each lap. How Many minutes after the start will the faster horse have a one lap lead?