A planet moves around the sun. At a point A, it is closest from the Sun at a distance d1 and has a speed v1. At another point B, when it is farthest from the sun at a distance d2, its speed will be
$\dfrac{d_{1}v_{1}}{d_{2}}$
$\dfrac{d_{2}v_{1}}{d_{1}}$
$\dfrac{d_{1}^{2}v_{1}}{d_{2}^{2}}$
$\dfrac{d_{2}^{2}v_{1}}{d_{1}^{2}}$