Replace the question mark with the correct number.

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

what's the probability of getting a king or a queen from a pack of 52 cards?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

Prove that twice of ten is the same as twice of eleven.

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Why are all black people so quick ?