If Rajina's daughter is my daughter's mom, who am I to Rajina?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

Where do fish keep their money?

When we see 2 but call 10?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?