What is more useful when it is broken?

I add 5 to 9 and get 2. The answer is correct, so what am I?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What does this rebus picture identify?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

Why Aeroplane windows are round?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

There is a circular car race track of 10km. There are two cars, Car A and Car B. And they are at the exact opposite end to each other. At Time T(0), Both cars move toward each other at a constant speed of 100 m/seconds. As we know both cars are at the same speed they will always be the exact opposite to each other.
Note, at the center, there is a bug which starts flying towards Car A at time T(0). When the bug reaches car B, it turns back and starts moving towards the car A. The speed of bug is 1m/second. After 5 hours all three stop moving.
What is the total distance covered by the bug?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

What is the next number?

77, 49, 36, 18 ?