What is common among 11, 69, and 88?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Why is the longest human nose just 11 inches?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

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?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

Name a key which is hardest to turn.

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?