People make me, save me, change me, raise me. What am I?

Why is it very easy to weigh a fish?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

With the help clues provided in the image, can you find the 5 digit key?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

What has lots of eyes, but can’t see?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?