Arithmetic

Time, Speed & Distance

Medium

On a journey of 300 km, a person travels the first 100 km at the speed of 40 km/hour, the next 50 km at the speed of 60 km/hour and the last 150 km at the speed of 50 km/hour. What is his average speed (in km/hour) for the entire journey?

47.36

51.10

49.36

48.20

✅ Correct Option: 1

Total time $= \dfrac{100}{40} + \dfrac{50}{60} + \dfrac{150}{50} = 2.5 + 0.833 + 3 = 6.333$ hours.

Average speed $= \dfrac{300}{6.333} \approx 47.36$ km/h.

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Solution

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