Priya's father works a night shift at Changi Airport. His shift starts at 10:30 p.m. and ends at 6:15 a.m. the next morning. How long is his shift?
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Worked Solution
The shift crosses midnight, so split it into two parts.
Step 1: Find the time from 10:30 p.m. to midnight.
From 10:30 p.m. to 11:00 p.m. = 30 min
From 11:00 p.m. to 12:00 midnight = 1 h
Total first part = 1 h 30 min
Step 2: Find the time from midnight to 6:15 a.m.
Midnight to 6:15 a.m. = 6 h 15 min
Step 3: Add both parts.
1 h 30 min + 6 h 15 min = 7 h 45 min
Check: 10:30 p.m. + 7 h 45 min = 6:15 a.m. ✓
His shift is 7 hours 45 minutes long.
Correct answer: 7 h 45 min
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