What's the best place to go shopping in the ocean?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

What can you hold in your right hand, but never in your left hand?

What building has the most stories?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

What English word has three consecutive double letters?

What does this rebus means ?

What number do you get when you multiply all of the numbers on a telephone's number pad?