There are three planets in circular orbits around a fixed

Last updated: 6/7/2023

There are three planets in circular orbits around a fixed star at distances a 4a and 9a respectively in same sense say anticlockise At time t 0 the star and the three planets are in a straight line The period of revolution of the closest planet is T What minimum time after t 0 will they again be in the same straight line D ST 27 T