In a large hospital with several operating rooms, ten people are each waiting for a 45 minute operation. The first operation starts at 8:00 a.m., the second at 8:15 a.m., and each of the other operations starts at 15 minute intervals thereafter. When does the last operation end?
(A) 10:15 a.m.
(B) 10:30 a.m.
(C) 10:45 a.m.
(D) 11:00 a.m.
(E) 11:15 a.m.
Since there are ten people scheduled for an operation and each operation begins 15 minutes after the previous one, the tenth operation will begin nine 15 minute intervals after the first operation began at 8:00 a.m.

Nine 15 minute intervals is 135 minutes, or 2 hours 15 minutes.

Thus, the tenth 45 minute operation begins at 10:15 a.m. and so ends at 11:00 a.m.

ANSWER: (D)

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