Random Puzzles 

Workings

Hint

Answer
Throw it up into the air!

Workings

Hint
Light travels around 186,000 miles each second.

Answer
Miles that light can travel in 3 minutes.

There are 31,536,000 seconds in a typical year, and light can travel about 33,530,831 miles in 3 minutes.

Workings

Hint
Start by filling the 9 gallon container, and then use that to fill the 4 gallon container.

Answer
Here are the contents of the containers after each stage:
A   B
9   0      fill A
5   4      fill B from A
5   0      empty B
1   4      fill B from A
1   0      empty B
0   1      fill B from A
9   1      fill A
6   4      fill B from A
6   0      empty B

This leaves 6 gallons in container A.

Workings

Hint
Try saying the letters out loud.

Answer
E.

These are letters which all sound the same, bee, see, dee, ee, etc. All depending on how you pronounce Z (zee or zed), you can include this.