Identify the hidden meaning behind this picture?

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?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What does this rebus riddle means ?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

In the image below, can you find the value of an angle(y)