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A train goes from P to with a speed u km...

A train goes from P to with a speed u km/h, then from Q to R (QR = 2PQ) with a speed 3u km/h and return form 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

`(4u)/3`

C

`(16u)/23`

D

`(3u)/2`

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