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There are two circles C(1) and C2 whose ...

There are two circles `C_(1)` and `C_2` whose radii are `r_(1), r_(2)`, respectively. If distance between their centre is `3r_(1) - r_(2)` and length of direct common tangent is twice of the length of transverse common tangent. Then `r_(1): r_(2)` is:

A

`5:4`

B

`6:5`

C

`7:6`

D

`8:7`

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The correct Answer is:
C
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