A man divided his journey into three parts of distances of 18 km, 20 km and 27 km. He travelled the distances at the speeds of 6 km/h, 5 km/h and 9 km/h, respectively. What was his average speed during the entire journey?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e 6.5 km/h.
| Understanding | Application |
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Speed = Distance/Time Time = Distance/Speed Average Speed = Total distance/Total time |
Total Distance = 18 km + 20 km + 27 km = 65 km Total time = 18/6 + 20/5 + 27/3 = 3 + 4 + 3 = 10 hour Average Speed = 65/10 = 6.5 km/h |