I drive at an average speed of 30 miles per hour to the railroad station each morning and catch my train. On a particular morning, there was a lot of traffic and at the halfway point, I had averaged only 15 miles per hour. How fast must I drive for the rest of the way to catch my train?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Can you solve the below rebus?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

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

Why do people go to bed?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?