How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

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?

What am I?

What has one eye, but can’t see?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

What does this Rebus Picture mean?

I cannot talk, but I always reply when spoken to. What am I?