By looking in a mirror, it appears that it is 3:30 in the clock. Determine the real time at that instant moment?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 8:30
Step 1: Mirror image time rule
- When a clock shows real time t, its mirror image time is:
$\text{Mirror time} = 12:00 - \text{real time}$
- Or, equivalently:
$\text{Real time} = 12:00 - \text{Mirror time}$
Step 2: Mirror time given
- Mirror image shows 3:30
- Convert 3:30 into minutes: $3 \times 60 + 30 = 210$ minutes
Step 3: Find real time
- Total minutes in 12 hours = 720 minutes
$\text{Real time in minutes} = 720 - 210 = 510 \text{ minutes}$
- Convert 510 minutes back to hours and minutes:
$510 \div 60 = 8 \text{ hours } 30 \text{ minutes}$
So, the real time = 8:30