A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

Count the number of balls in picture below:

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Forwards I am heavy, backward I am not. What am I?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?