When monkey rotate the gear, which mark will be hit 1 or 2 ?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

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

You see me once in June, twice in November, and not at all in May. What am I?

What has 13 hearts but no other organs?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

Which Travels Faster? Solve below famous picture riddle:

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?