Correct Answer - Option 1 : 5 km

**Given:**

Speed = 12 km/hr

Increased speed = 8 km/hr

**Formula used:**

Time = Distance/ Speed

**Calculation:**

Let the distance be x km

According to the question

[(x/12) – (5/60)] = [(x/20) + (5/60)]

⇒ (5x – 5)/60 = (3x + 5)/60

⇒ (5x – 5) = (3x + 5)

⇒ (5x – 3x) = 5 + 5

⇒ 2x = 10

⇒ x = 5

**∴ The value of distance is 5 km.**