Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

81 x 9 = 801. What must you do to make the this equation true?

Which Travels Faster? Solve below famous picture riddle:

You can see it everyday, But cannot touch it at will. What is it?

What do you get if you add 2 to 100 four times?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Find the next number in the sequence

5 12 24 36 ?

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.