What begins with T, ends with T, and has T in it?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

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?

What does the below mathematical rebus mean?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

When can we add 2 to 11 and get 1 as the correct answer?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

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

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??