PA and PB are two tangents drawn to two circles of radius 3

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SSC CGL Tier-2 9-March-2018 Maths Shift-2
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PA and PB are two tangents drawn to two circles of radius 3 cm and 5 cm respectively. PA touches the smaller and larger circles at points X and Y respectively. PB touches the smaller and large circle at point U and V respectively. The centres of the smaller and larger circles O and N respectively. If ON =12 cm, then what is the value (in cm) of PY?

[SSC CGL Tier-2 9-March-2018 Maths Shift-2]

A 5√35

B 7√15

C 9√15

D 12√5