What does this rebus means ?

PROG WORKRESS

A sundial has the fewest moving parts of any timepiece. Which has the most?

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

Do you know who was buried in John's tomb?

Can you find the mistake in the below statement?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

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?