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?

What does this mathematical rebus means ?

What is next number in the pattern below:

131 517 192 123 ?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

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

Find the number of squares in the below-given picture.

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

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