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?

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

Can anyone tell me a word in the English dictionary which has a silent 'z'?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

What does this rebus mean?

O
N
C
E
TIME

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Find three whole, positive numbers that have the same answer when multiplied together as when added together.