You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

What is the word or phrase?

No matter how little or how much you use me, you change me every month. What am I?

When it's bad luck to meet a black cat?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Out of four images which one is the odd one out?

Can you name an animal whose killing cannot be performed without spilling your own blood?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?