A straight line l1 with equation x-2y+10...

A straight line `l_1` with equation `x-2y+10=0` meets the circle with equation `x^2+y^2=100` at `B` in the first quadrant. A line through `B` perpendicular to `l_1` cuts the y-axis at `P(o,t)` . The value of `t` is 12 (b) 15 (c) 20 (d) 25

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