Max completes his journey at an average speed of 9 km/h. He covers the first 9 km at a speed of 6 km/h and he takes 1·5 hours to cover the remaining distance. Find out the speed at which he covered the remaining distance.

**(A)** 11 km/h

**(B)** 12 km/h

**(C)** 13 km/h

**(D)** 15 km/h

**Answer:** **(B)** **Explanation:** Let the required speed be x km/h.

Total time taken to finish his journey = (9/6 + 1·5) = 3 hours.

Total distance = 9 + 1·5x km.

Given, average speed = 9 km/h.

Therefore, (9 + 1·5x)/3 = 9

⇒ 9 + 1·5x = 27

⇒ 1·5x = 18

⇒ x = 12 km/h.

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