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?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

I have Rs.50 and I spend it in the way as below.

Replace the question mark with the correct number below.

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

How do you go from 98 to 720 using just one letter?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?