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  3. In a certain medical group, Dr. Schwartz schedules appointments to begin 30 minu

In a certain medical group, Dr. Schwartz schedules appointments to begin 30 minu

游客2024-01-12  75
问题 In a certain medical group, Dr. Schwartz schedules appointments to begin 30 minutes apart, Dr. Ramirez schedules appointments to begin 25 minutes apart, and Dr. Wu schedules appointments to begin 50 minutes apart. All three doctors schedule their first appointments to begin at 8:00 in the morning, which are followed by their successive appointments throughout the day without breaks. Other than at 8:00 in the morning, at what times before 1:30 in the afternoon do all three doctors schedule their appointments to begin at the same time?
Indicate all such times.
A 9:30 in the morning
B 10:00 in the morning C 10:30 in the morning
D 11:00 in the morning
E 11:30 in the morning F 12:00 noon
G 12:30 in the afternoon H 1:00 in the afternoon
选项
答案 C，H
解析 By examining the pattern of beginning times for the three types of appointments, you can see that the times will coincide when the number of minutes after 8:00 in the morning is a common multiple of 30, 25, and 50. The least common multiple of 30, 25, and 50 is 150, which represents 150 minutes, or 2.5 hours. So the times coincide every 2.5 hours after 8:00 in the morning, that is, at 10:30 in the morning, at 1:00 in the afternoon, and so on. The correct answer consists of Choices C and H.
This explanation uses the following strategy.
Strategy 7: Find a Pattern
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