- 40 km/h
- 42 km/h
- 39 km/h
- 36 km/h

Option 4 : 36 km/h

**Given:**

Speed when car goes Bhopal to Agra = 30 km/h

Speed when car returns from Agra = 45 km/h

**Formula used:**

Average speed = 2ab/(a + b)

a = Speed a object when it goes from A to B.

b = Speed of a object when it returns same place.

**Calculation:**

According to the question,

Average speed = (2 × 30 × 45)/(30 + 45)

⇒ Average speed = (2 × 30 × 45)/75

⇒ Average speed = 36 km/h

**∴ The average speed of the car is 36 km/h.**

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