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?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What is the next number in this series?

4,12,84,3612....

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

Who am I?

Can you find the 09 errors in the picture below?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

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