If an electric train is travelling south, then which way is the smoke going?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

I am working in a bus company. The company recently went under expansion and therefore there was not enough room for all the buses. As a result, twelve buses had to be stored outside.

If the company decides to expand the garage space by forty percent, enough space to accommodate the current buses will be created leaving enough space for twelve more buses if the need arises in future.

Can you calculate the number of buses that the company owns at present?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

Buy me, smell me or deliver me, I do not change.

Who am I?

How can you make a TV, a bed, a dog, and a car liquid?

What is the next number in the series?

15 29 56 108 208 ?