If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

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

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

Our product and our sum always give the same answer. Who are we?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?