If a library educational event runs from 10-11am, what is the earliest start time for a second event at the same library given 12-hour separation and library hours 9am-8pm?

• A. 9am the same day
• B. 11am the same day
• C. 9am the next day
• D. 8pm the next day

Answer: (C)

Scheduling a second event with a required separation means finding the earliest start time that is both at least the specified gap away from the first event and within the library’s hours.

The first event runs 10–11am. If the separation is counted from the start time, 12 hours after 10am is 10pm, which falls outside the library hours (they close at 8pm). So a same-day start isn’t possible. The next available time within hours is 9am the next day. From 10am Day 1 to 9am Day 2 is well over 12 hours apart (about 23 hours), and 9am falls inside the 9am–8pm window. Therefore, 9am the next day is the earliest feasible start.

The other options either violate the required gap or occur later than the earliest feasible time within hours.