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

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

Solve the rebus riddle in the picture below.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Which is faster, Heat or Cold ? Explain.

Can you count the number of matches in the picture below ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

how come the second man dies?