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The wording of the question is tricky.BTGmoderatorDC wrote: ↑Fri Jan 24, 2020 4:37 pmA certain hall contains two cuckoo clocks. If the first clock chirps 20 times per hour and the second clock chirps 10 times per hour, and both clocks begin chirping at 1:15 PM, at what time will the first clock have chirped three times as many times as the second clock can per hour?
A. 1:24 PM
B. 2:05 PM
C. 2:30 PM
D. 2:45 PM
E. 4:15 PM
OA D
Source: Veritas Prep
"At what time will the first clock have chirped three times as many times as the second clock CAN (!!) per hour?"BTGmoderatorDC wrote: ↑Fri Jan 24, 2020 4:37 pmA certain hall contains two cuckoo clocks. If the first clock chirps 20 times per hour and the second clock chirps 10 times per hour, and both clocks begin chirping at 1:15 PM, at what time will the first clock have chirped three times as many times as the second clock can per hour?
A. 1:24 PM
B. 2:05 PM
C. 2:30 PM
D. 2:45 PM
E. 4:15 PM
OA D
Source: Veritas Prep
Since the second clock can chirp 10 times per hour and we want the first clock to chirp 3 times as many, we want the first clock to chirp 30 times. Since the first clock chirps 20 times per hour (60 minutes), it will chirp 30 times in 60/20 x 30 = 3 x 30 = 90 minutes. Therefore, at 1:15 PM + 90 minutes = 2:45 PM, the first clock will have chirped three times as many times as the second clock can per hour.BTGmoderatorDC wrote: ↑Fri Jan 24, 2020 4:37 pmA certain hall contains two cuckoo clocks. If the first clock chirps 20 times per hour and the second clock chirps 10 times per hour, and both clocks begin chirping at 1:15 PM, at what time will the first clock have chirped three times as many times as the second clock can per hour?
A. 1:24 PM
B. 2:05 PM
C. 2:30 PM
D. 2:45 PM
E. 4:15 PM
OA D
Source: Veritas Prep
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