Two regular blinkers begin with synchronized blinks at time 0, and afterwards there is an [bold: average] of one blink per minute from the two blinkers together. However, they never blink simultaneously again (equivalently, the ratio of their frequencies is irrational).

Prove that after the first minute (from time 0:00 to time 0:01) there is [bold: exactly one blink] in every interval between time t minutes (t an integer) and time t + 1!