The story goes that when the Swiss did not have so much experience yet with making clocks, a painful mistake was made with a church clock. The clock was officially put into use when it showed 6 o'clock. Soon it was noticed that the hour hand and minute hand had been interchanged and attached to the wrong axes. The result was that the hour hand moved with a speed twelve times higher than the minute hand. When the clock maker arrived, a remarkable thing happened: on the moment he inspected the clock, it showed exactly the right time again.

The question: If the clock started at 6 o'clock in the correct position, then what was the first moment that it showed the correct time again?

A hint : Click here!

The answer: Click here!