A train goes from P to Q with a speed u km/h, then from Q to R (QR = 2PQ) with a speed 3u km/h, and returns from R to P With a speed u/2 km/h. What is the average speed (in km/h) of the train for the entire journey starting from P and back to P?

A train goes from P to Q with a speed u km/h, then from Q to R (QR = 2

1.	A train goes from P to Q with a speed u km/h, then from Q to R (QR = 2PQ) with a speed 3u km/h, and returns from R to P With a speed u/2 km/h. What is the average speed (in km/h) of the train for the entire journey starting from P and back to P?
A.	18u/23
B.	3u/2
C.	4u/3
D.	16u/23
Answer» B. 3u/2

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A train goes from P to Q with a speed u km/h, then from Q to R (QR = 2PQ) with a speed 3u km/h, and returns from R to P With a speed u/2 km/h. What is the average speed (in km/h) of the train for the entire journey starting from P and back to P?

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