What is more useful when it is broken?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

There is something which is always coming but never arrives?

What runs around the whole yard without moving?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Count the number of lines in the image below ?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?