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

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

On 26-01-2022, Juli was murdered at her house in a city in India in the afternoon. There were three suspects in the murder and the following are the statements that were given by them:

John: I visited my village that day.
Jacob: I was out to deposit my house tax in the municipality office at that time.
Jonny: I was at a friend's place having lunch at that time.

Can you find out who is the murderer?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

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 is in seasons, seconds, centuries and minutes but not in decades, years or days?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Can you count the number of blocks in the picture below?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Can you replace the question mark with the correct number?