Why do we preferably have round manhole covers and not square ones?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

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

I am the fastest animal but cannot climb the tree. What am I?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What brings you down but never up?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

A man dies of old age on his 25 birthday. How is this possible?

Replace the question mark with the correct number in the below-given picture?