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Solution to: Mirroring Clock

The difference between the real time and the time of the mirror image is two hours and ten minutes (two and a half hours, minus the twenty minutes of cycling). Therefore, the original time on the clock at home that morning could only have been five minutes past seven:

Solution
Original (7:05)
Solution
Mirror image (4:55)

The difference between these clocks is exactly 2 hours and ten minutes (note that five minutes past one can also be mirrored in a similar way, but this is not in the morning!).

Conclusion: The boy reaches school at five minutes past seven plus twenty minutes of cycling, which is twenty-five minutes past seven!


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