Three paramedics were boasting about their respective ambulance team's response times. "With our new satellite navigation system," bragged one, "we've cut our emergency response time by ten percent." The second paramedic commented. "By using a computer model of traffic patterns, we we cut our average time by 20 percent." "That's nothing said the third paramedic. "Since our ambulance driver passed the bar exam, we've cut our emergency response time in half!"