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?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

You need to arrange three 7 and mathematical symbols to form number 1?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Prove that the below maths equation is true.

8 + 8 = 91

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Can you count the number of blocks in the picture below?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What word is represented by this rebus?