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A line $l$ intersects the sides PQ and PR of a $\triangle PQR$ at L and M respectively such that LM $||$ QR. If PL = $5.7$ cm, PQ = $15.2$ cm and MR = $5.5$ cm, then the length of PM (in cm) is :
- (a)$3$
- (b)$1.8$
- (c)$2.5$
- (d)$3.3$
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(D) $3.3$