You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

What word is represented by this rebus?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

Spot what is wrong here in below Picture?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?