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QA – Placement Quizzes | Time Speed Distance | Question 7

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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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Last Updated : 28 Jun, 2021
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