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A train goes from P to Q with a speed uk...

A train goes from P to Q with a speed ukm/h, then from Q to R (QR = 2PQ) with a speed 3 `mu` km/h, and returns from R to P with a speed `mu`/2km/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)`

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