Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Which alphabet is a part of our body?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

During which month do people sleep the least?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?