[tvawnz]

Anyone else having difficulty with their example problem? I keep getting 41 minutes difference, not 43.

[claar]

That's fantastic.. the "simple" calculation was so simple that the example/explanation contained an error.

[InclinedPlane]

A classic example of adding when one should be subtracting, and the answer is close enough that the error isn't obvious.

The correct answer is 41, which is 12 - 31 + 60