Question: You are in a car with some helium balloons and hit the gas. While you accelerate, which way does the balloon move?
Answer: It moves forward towards the front of the car, even though you are forced backwards. The helium balloon is less dense than the air so when you accelerate the air in the car will move backwards compared to the balloon pushing the balloon forward because the balloon is lighter.
Question: What's the angle between minute hand and hour hand at a quarter past three?
Answer: 7.5 degrees.
The minute hand is pointing directly at the '3'. The hour hand is 1/4 of the way between the '3' and '4'. Since there are 12 numbers the angle between each number is 30 degrees. So the angle between the hands are 30 degrees * 1/4 = 7.5 degrees.