A plane crashed between the border of Mexico and America. Where do you bury the survivors?

If an electric train is travelling south, then which way is the smoke going?

I am an odd number. Take away a letter and I become even. What number am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?