[dragonwriter]

> My favorite pet math problem so far is: how many times of day are all three hands on a clock equal parts apart?

Depends on the clock.

(Three hand clocks can be d/h/m or h/m/s.)

[ajkjk]

I have never seen a d/h/m clock.

[willis936]

The differential equations would be the same, just with different coefficients.