A broken clock is right twice a day, but a clock running backwards is right four times a day.
This only works with 1-dimensional time though.
Luckily we don’t build clocks for n-dimensional time
Depends how fast is going backwards
Also depends how the other clock is broken, if we’re this picky about it.
That’s why the correct term is ‘a stopped clock’ not a broken one.
A broken clock is right twice a day, but a running clock is probably never right.
My grandfather clock is correct* about once a week when I wind and correct it
*It must be correct as it’s very slightly fast (less so than can be fixed with a quarter turn off the pendulum screw) and I set it slightly in the past
time dilation ftw!
At this point you get into a philosophical discussion about what “right” really means
Two wrong don’t make a right, but three left turns do.
I’m really picky when it comes to clocks. They need to be ±1 minute. If they aren’t it really starts to bother me.