In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

It is always ahead of me yet I can never see it. What is it?

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?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Which is the smallest number that you can write using all the vowels exactly once?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

How do you go from 98 to 720 using just one letter?