At 1:00, Annie starts to bicycle along a 87 mile road at a constant speed of 15 miles per hour. Thirty minutes earlier, Scott started bicycling towards Annie on the same road at a constant speed of 12 miles per hour. At what time will they meet?  Pick
A) 2:30  B) 3:00  C) 4:00  D) 6:00  E) 9:00
In the first 30 minutes, Scott can travel 6 miles, so there are 81 miles left.   Together Annie and Scott can complete 27 miles.   81/27= 
<gadget id="calculator">81/27</gadget>
<output>3</output>
3, so they will meet 3 hours after 1:00.   The answer is 4:00.
<result>C</result>
At 1:00, Annie starts to bicycle along a 87 mile road at a constant speed of 15 miles per hour. Thirty minutes earlier, Scott started bicycling towards Annie on the same road at a constant speed of 12 miles per hour. At what time will they meet?