What is the coolest letter in the alphabet?

Solve below rebus puzzle?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

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

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

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

Why is it very easy to weigh a fish?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?