A baby falls asleep at 7:55 PM and sleeps for 6 3/4 hours. At what time does the baby wake?

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Multiple Choice

A baby falls asleep at 7:55 PM and sleeps for 6 3/4 hours. At what time does the baby wake?

Explanation:
When you add a duration to a start time and cross midnight, break the duration into hours and minutes and add step by step. The sleep time is 6 3/4 hours, which is 6 hours and 45 minutes. Start at 7:55 PM. Adding 6 hours brings you to 1:55 AM (the time crosses into the next day). Then add the remaining 45 minutes to reach 2:40 AM. So the baby wakes at 2:40 in the morning. A quick check: from 7:55 PM to midnight is 4 hours 5 minutes, and from midnight to 2:40 AM is 2 hours 40 minutes; total is 6 hours 45 minutes, which matches the duration.

When you add a duration to a start time and cross midnight, break the duration into hours and minutes and add step by step.

The sleep time is 6 3/4 hours, which is 6 hours and 45 minutes. Start at 7:55 PM. Adding 6 hours brings you to 1:55 AM (the time crosses into the next day). Then add the remaining 45 minutes to reach 2:40 AM. So the baby wakes at 2:40 in the morning. A quick check: from 7:55 PM to midnight is 4 hours 5 minutes, and from midnight to 2:40 AM is 2 hours 40 minutes; total is 6 hours 45 minutes, which matches the duration.

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