There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

I am white when I am dirty, and black when I am clean. What am I?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

John was piloting a plane behind a car but was never able to overtake it. Why?

Identify the hidden meaning behind this picture?

Replace the question mark with the number below given a simple math problem.

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???