Cycles and Time: Time Spans

Methods in this video

Tap a time to jump to where the video teaches that method.

1. 1

   Step back as long as the ticket lasts

   ▶ 0:40

   When to use it: A ticket or pass lasts a set time from its start, and the question asks how many people could be inside at one moment.

   • Each ticket is a bar of time; make one cut at the moment you are asked about.
   • Step back one ticket length from that moment. Every ticket that starts in between is still valid.
   • Earlier tickets have run out, and later tickets have not started yet.
2. 2

   How far apart? First start to last end

   ▶ 2:16

   When to use it: A year or month is split into periods. Two events fall in neighbouring periods yet are a long way apart, and the question asks which period one of them is in.

   • The event could fall on any day of its period, so measure the furthest it can be.
   • Furthest apart = start of the first period to the end of the next.
   • Check the pair that wraps around the year, then see which of the two periods is being asked about.