In the given figure a planet is moving around the sun. The swept area and the time taken by the planet are A1 and t1 respectively when it moves from A to B, similarly A2 and t2 respectively when it moves from X to Y. If the ratio of the A1 to A2 is 1 : 2, then find the ratio of the t1 to t2.
1
1 : 2
2
2 : 1
3
1 : 1
4
None of these