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In a certain medical group, Dr. Schwartz schedules

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1612 [0], given: 375

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In a certain medical group, Dr. Schwartz schedules [#permalink] New post 15 May 2016, 18:05
Expert's post
00:00

Question Stats:

53% (01:28) correct 46% (02:01) wrong based on 13 sessions
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

Practice Questions
Question: 16
Page: 64


[Reveal] Spoiler: OA
C and H
[Reveal] Spoiler: OA

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2 KUDOS received
GMAT Club Legend
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User avatar
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1612 [2] , given: 375

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Re: In a certain medical group, Dr. Schwartz schedules [#permalink] New post 15 May 2016, 18:07
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Explanation

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.
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Sandy
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Joined: 10 Jun 2018
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Re: In a certain medical group, Dr. Schwartz schedules [#permalink] New post 03 Sep 2018, 16:43
The numbers are 30, 25 and 50.
the common multiples of 30,25 and 50 are 150 min or 2 hours 30 min and 300 min or 5 hours
Time starts from 8:00. After 2.30 hr the time is 10.30 and after 5 hours it is 1.00 pm.
So the answer is C and H
Re: In a certain medical group, Dr. Schwartz schedules   [#permalink] 03 Sep 2018, 16:43
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In a certain medical group, Dr. Schwartz schedules

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