How many times in a given day, minutes and hour clock comes in a straight line ?

During which month do people sleep the least?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

What does the below image rebus riddle means ?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?