A person divides the route of his journey into three equal parts and decides to travel the parts at the speeds of 40 km/h, 30 km/h and 15 km/h, respectively. What is his average speed during the whole journey?

A person divides the route of his journey into three equal parts and d

1.	A person divides the route of his journey into three equal parts and decides to travel the parts at the speeds of 40 km/h, 30 km/h and 15 km/h, respectively. What is his average speed during the whole journey?
A.	24 km/h
B.	15 km/h
C.	12 km/h
D.	20 km/h
Answer» B. 15 km/h

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A person divides the route of his journey into three equal parts and decides to travel the parts at the speeds of 40 km/h, 30 km/h and 15 km/h, respectively. What is his average speed during the whole journey?

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