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If the radii of the circle (x-1)^2+(y-2)...

If the radii of the circle `(x-1)^2+(y-2)^2=1` and `(x-7)^2+(y-10)^2=4` are increasing uniformly w.r.t. times as 0.3 unit/s is and 0.4 unit/s, then they will touch each other at `t` equal to `45s` (b) `90s` (c) `11s` (d) `135s`

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