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Clock Mirror - Medium

Clock Mirror Medium problems involve finding mirror times for times with minutes (e.g., 3:15, 4:30). The formula remains Mirror Time = 11:60 - Given Time. You must handle borrowing when minutes subtract result is negative.

10Worksheets
200+Practice Questions
MediumDifficulty
2-3 hoursHours to Master

What You'll Learn

Introduction & Overview Why This Matters How to Solve Pro Tips & Tricks
Shortcut Methods Common Mistakes Practice Worksheets Exam Importance

Introduction to Clock Mirror - Medium

Clock Mirror Medium problems involve finding mirror times for times with minutes (e.g., 3:15, 4:30). The formula remains Mirror Time = 11:60 - Given Time. You must handle borrowing when minutes subtract result is negative.

Prerequisites

Time subtraction with borrowing 60 minutes in an hour 12-hour clock format Mirror time formula: 11:60 - given time
Why This Matters: Clock Mirror Medium problems appear in 1-2 questions in SSC CGL and Banking PO exams. They test time subtraction with minutes.

How to Solve Clock Mirror - Medium Problems

1

Step 1: Write given time as HH:MM

2

Step 2: Mirror time = 11:60 - HH:MM

3

Step 3: Subtract minutes: 60 - MM = mirror_minutes

4

Step 4: If MM = 0, mirror_minutes = 0, no borrowing needed

5

Step 5: Subtract hours: 11 - HH = mirror_hours

6

Step 6: If mirror_hours = 0, display as 12

7

Step 7: Format mirror time as HH:MM with leading zeros

Pro Strategy: Use the formula Mirror Time = 11:60 - Actual Time. Subtract minutes first; if minutes borrow is needed, subtract 1 from hours before subtracting.

Example Problem

Example: What time will a clock show in a vertical mirror if the actual time is 4:25? Solution: Step 1: Given time = 4:25 Step 2: 11:60 - 4:25 Step 3: 60 - 25 = 35 minutes Step 4: 11 - 4 = 7 hours Step 5: Mirror time = 7:35 Answer: 7:35

Pro Tips & Tricks

  • Mirror time = 11:60 - actual time
  • Mirror minutes = 60 - actual minutes (if actual minutes > 0)
  • Mirror minutes = 0 if actual minutes = 0
  • Mirror hours = 11 - actual hours (if actual minutes = 0)
  • Mirror hours = 10 - actual hours (if actual minutes > 0, because of borrowing)
  • Example: 4:25 → 60-25=35 min, 11-4=7 hours → 7:35

Shortcut Methods to Solve Faster

Mirror minutes = (60 - actual_minutes) % 60
Mirror hours = (11 - actual_hours - (1 if actual_minutes > 0 else 0)) % 12
If mirror_hours = 0, display as 12
Actual time + mirror time = 12:00 (in minutes)

Common Mistakes to Avoid

Forgetting to borrow when actual minutes > 0
Using 12:00 instead of 11:60 in the formula
Displaying 0:xx instead of 12:xx
Not handling minute zero correctly

Exam Importance

Clock Mirror - Medium is an important topic for various competitive exams. Here's how frequently it appears:

SSC CGL
1-2 questions
BANKING PO
1-2 questions
RAILWAYS RRB
1-2 questions
INSURANCE
1-2 questions

Ready to Master Clock Mirror - Medium?

Start with Worksheet 1 and work your way up to expert level! Each worksheet includes:

20 practice questions
Detailed solutions
Step-by-step explanations
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