Each letter is coded by its position in the alphabet. F=6, A=1, T=20, H=8, E=5, R=19

After going North and South equally, he returns to original latitude. Only 6 km East displacement remains.

This is a pattern-recognition problem where we must discover the hidden operation rule connecting the inputs and outputs.

Step 1: Analyze the first given equation

For \(5 * 4 = 19\), test different operations:

Step 2: Verify the pattern with the second equation

For \(7 * 3 = 22\), apply the same rule:

So the rule is not simply \(a \times b - 1\). Let's try: \(a \times b + (a - b)\)

Let's try: \(a \times b + (a + b)\)

Step 3: Test alternating patterns

Actually, let me reconsider. For \(5 * 4 = 19\):

For \(7 * 3 = 22\):

The pattern alternates: subtract 1 when the first number is odd and second is even, add 1 when the first number is odd and second is odd.

Step 4: Apply the rule to \(6 * 5 = ?\)

Since 6 is even and 5 is odd (different from both previous cases), we follow the pattern:

Answer: \(6 * 5 = 29\) (Option A)

Pattern: n(n+1). 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42

Grandfather's only son = her father. Father's son = her brother

Apple, Orange, and Banana are fruits. Potato is a vegetable.

Minute hand at 3 (90°). Hour hand moves 0.5° per minute, so at 15 min: 90 + 7.5 = 97.5°. Difference = 97.5 - 90 = 7.5°

All others are perfect squares (11², 12², 13², 14², 15²). 250 is not a perfect square.

The word is reversed. PAINT reversed = TNIAP. SMART reversed = TRAMS

Speed = 150/15 = 10 m/s = 10 × 3.6 = 36 km/h