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 number should come in place of the question mark below?

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

Solve below popular number sequence
314 159 265 358 979 323 846 ?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

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?

Count the Triangle in the figure given below:

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?