A train leaves at 22:00 on a 24-hour clock, and the journey takes 39 hours. At what hour does it arrive?

Explanation

1. 01

   A 24-hour clock works modulo 24: $22 + 39 = 61$.

2. 02

   $61 = 24 \times 2 + 13$, so it arrives at 13:00, two days later.