A travels a certain distance with three different speeds; first 3 km with a speed of 9 km/h, second 6 km with a speed of 15 km/h, and third 9 km with a speed of 18 km/h. What is the average speed of A for the whole journey?

A travels a certain distance with three different speeds; first 3 km w

1.	A travels a certain distance with three different speeds; first 3 km with a speed of 9 km/h, second 6 km with a speed of 15 km/h, and third 9 km with a speed of 18 km/h. What is the average speed of A for the whole journey?
A.	\(\frac{{460}}{{37}}\;km/h\)
B.	\(\frac{{540}}{{37}}\;km/h\)
C.	\(\frac{{660}}{{37}}\;km/h\)
D.	\(\frac{{480}}{{37}}km/h\)
Answer» C. \(\frac{{660}}{{37}}\;km/h\)

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A travels a certain distance with three different speeds; first 3 km with a speed of 9 km/h, second 6 km with a speed of 15 km/h, and third 9 km with a speed of 18 km/h. What is the average speed of A for the whole journey?

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