What does this rebus puzzle means ?

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?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

I taste better than I can smell. Who am I?

What has a ring but no finger?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Which digit occurred maximum times between the number 1 and 1000?