What four weights can be used to balance from 1 to 30 pounds?

How is a fly different from a mosquito?

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?

Which Burger Is Different in below image?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

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

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What has many teeth, but cannot bite?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H