What is always in front of you but can’t be seen?

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?

Find the 8 in the below-given Image.

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

I am an odd number. Take away a letter and I become even. What number am I?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

Can you solve below mathematical equation?

2^1234 - 2^1233

Can you count the number of triangles in the given picture?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?