Two Broken Clocks
Liz has 2 clocks, after every 1 day, one clock will be 20 minutes faster, and the other clock will be 30 minutes slower. Liz adjusted the two clocks so that they show the same time and regularly comes back to check the clocks every 24 hours, how many days Liz has to wait until she can see the two clocks showing the same time again?
(Note: A.M. and P.M. doesn't matter, as long as the faces of the 2 clocks are the same)
This is one part of 1+1 is not = to 3.