10+10 and 11+11 can give you the same answer.

Explain how?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

How many letters are in the alphabet?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

Which flower has two lips?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

I am the fastest animal but cannot climb the tree. What am I?