Glass

The sun and the moon.

3,4,5…… A triangle of sides of 3,4,7 is impossible to construct

They are going opposite directions

The maid because there’s no post on Sundays.

The lawyer is female.

7.5 minutes. Do them all at once.

He puts one plank across the corner of the square (where two sides meet) and puts the other perpendicular to it to form a ‘T’ shape in the corner allowing him to cross the moat and save his beloved.

The teller used the mute button on the phone so her mother only heard “Emergency… Call… Help.” This is how she knew to call the police.

The Teacher. It’s still the first day of school so there would be no grades.