In trianglePQR, a line parallel to QR me...

In `trianglePQR`, a line parallel to QR meets PQ and PR at X and Y. If PX = 4.8cm., PY = 6.4cm. And YR = 9.6cm. Then the length of PQ is

A

4.6cm.

B

8.4cm.

C

12cm.

D

14cm.

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