Can you replace the question mark with the correct number?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

John was piloting a plane behind a car but was never able to overtake it. Why?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

A father's child, a mother's child, yet no one's son.

Who am I?

Can you make a six-letter word using the letters N, A and B ?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?