Can it be possible to build a house that has all its four walls facing towards the South?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Move three sticks of the spiral below to form a square.

Before Mount Everest was discovered, what was the highest mountain in the world?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?