Figure shows the motion of a planet around the Sun `S` in an elliptical orbit with the Sun at the

Figure shows the motion of a planet around the Sun `S` in an elliptical orbit with the Sun at the focus. The shaded areas `A` and `B` are also shown in the figure which can be assumed to be equal. If `t_(1)` and `t_(2)` represent the time taken for the planet to move from `a` to `b` and `c` to `d`, respectively then