My clock

Algebra Level 2

When I go running, I always wear my clock. It shows the normal time and of course my running time in the formats HH:MM:SS and MM:SS respectively.

Yesterday, when I looked at my clock while running, the running time and normal time matched, except that they were shifted. The hours of normal time were equal to the minutes of running time and the same for minutes and seconds.

If I had started running at 18:00 pm., at what time (normal time) did this occur?

18:19:19 18:18:00 19:19:00 18:18:19 18:18:18

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