What does this simple rebus mean?

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?

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

By what process could you make a 'Tea-Table' into food?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

Take one out and scratch my head, I am now black but once was red. What am I?

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

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

How can this be possible?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Can you start the fire using two pieces of wood?