What can go up a chimney down, but can’t go down a chimney up?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

Why is the Hole below a Lock?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

Count the number of triangles in the picture below:

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

What does below Rebus say?

XLR8

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------