At 3:15, the hour hand is at 97.5 degrees and the minute hand is at 90 degrees. The angle is 97.5 - 90 = 7.5 degrees.

C is the oldest as A is younger than C.

C is the daughter of D as C is the sister of A and A is the brother of B, making them all siblings.

D is the brother-in-law of A as C (D's sister) is married to A.

A is the father of C as A is the grandfather of B.

If B is 10, A is 20. In 5 years, A will be 25.

Turning 180 degrees from South leads to North. A 90 degrees left turn from North leads to West.

Facing South, a 45 degrees left turn leads to East-South-East. A 90 degrees right turn from there leads to East.

Turning 90 degrees right from South leads to West. Turning 90 degrees left from West leads back to South.

After walking south and turning left, he is facing East.

He is in the North-West direction from his starting point.

The man walks North, then turns left (West) and walks 10 meters, so he is now facing West.

Using tan(θ) = opposite/adjacent = 40/30, θ = tan⁻¹(4/3) = 53.13 degrees.

After turning 90 degrees clockwise, he faces East. After turning 180 degrees anti-clockwise, he faces West.

From East, a 270 degrees clockwise turn leads to South. A 90 degrees anti-clockwise turn from South leads to East.

Starting from South, turning left leads to East, and turning right from East leads to South.

From West, a 90 degrees right turn leads to North. A 90 degrees left turn from North leads back to West.

He ends up 10 meters West of his starting point after walking North, West, and South.

Using Pythagoras theorem, the distance is √(15^2 + 10^2) = √(225 + 100) = √325 = 18.03 meters.

After walking North and then South, he returns to the same latitude, and since he walked East, he is 5 km East of the starting point.

The arrangement is B, A, C, E, D. D is next to E.

The order is D, A, B, C, E. B is in the middle.

The conclusion does not hold true as penguins cannot fly.

The conclusion logically follows from the premises.

Since all cats are mammals and some mammals are not dogs, it follows that some cats are not dogs.

The conclusion is valid. The premises support the existence of machines that are not computers.

The conclusion does not necessarily follow from the premises.

The conclusion is valid. The premises support the existence of animals that bark but are not dogs.

The conclusion is valid. The premises allow for the existence of sweet things that are not fruits.

The conclusion logically follows from the premises.