You need to arrange three 7 and mathematical symbols to form number 1?

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?

What is the riddle which can be asked all day with a different correct answer each time.

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

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?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

What is more useful when it is broken?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

Which is heavier: a ton of bricks or a ton of feathers?

What does this rebus mean?

O
N
C
E
TIME