Solution
Given = $$P:Q:R=6:7:8$$ ---------(i)
and $$R:S=3:5$$ ------------(ii)
Multiplying equation (i) by 3 and equation (ii) by 8, we get :
=> $$P:Q:R=18:21:24$$ and $$R:S=24:40$$
Since, R is same in both, => $$P:S=18:40=9:20$$
=> Ans - (B)
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