A certain hall contains two cuckoo clocks. If the first clock chirps 20 times per hour and the second clock chirps 8 times per hour, and both clocks chirp for the first time at 2:03 pm, at what time will the first clock have chirped three times as many times as the second clock can chirp per hour? Select the correct option:  A) 2:40 pm  B) 2:55 pm  C) 3:12 pm  D) 3:24 pm  E) 3:45 pm
The question is asking when the first clock will have chirped 24 times (3*8 chirps).   The first clock chirps once every 3 minutes.   If the first chirp is at 2:03, then the 24th chirp is at 72 minutes after 2:00.   The answer is 3:12 pm.
<result>C</result>
A certain hall contains two cuckoo clocks. If the first clock chirps 20 times per hour and the second clock chirps 8 times per hour, and both clocks chirp for the first time at 2:03 pm, at what time will the first clock have chirped three times as many times as the second clock can chirp per hour?