What number should come in place of the question mark below?

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?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

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

What is more useful when it is broken?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

How can you leave a room with two legs and return with six legs?

The Judge knows that Alamgir was killed by his girlfriend Jasline, but the judge is unsure whether to punish her. Why?

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?