Finding the start time, step by step
You know when something ended and how long it ran — so when did it begin?
The question
4:30 − 25 min
- It ends at 4:30 after 25 minutes. Hop BACKWARDS the same way; counting back is what stops the hour from being borrowed.
- It all fits inside the one hour, so it is a single hop of 25 minutes backwards — no o'clock to cross.
- So it started at 4:05.
How it works.
- 01
It ends at 4:30 after 25 minutes. Hop BACKWARDS the same way; counting back is what stops the hour from being borrowed.
- 02
It all fits inside the one hour, so it is a single hop of 25 minutes backwards — no o'clock to cross.
- 03
So it started at 4:05.