UP Police SI Exam 12 Dec 2017 Shift 1 Solved Paper

Radha and Rani ran in opposite directions, starting simultaneously from the same point at an initial speed of 8 m/s and 2 m/s, respectively, on an 800 m long circular footpath. Whenever they met, Radha's speed was halved and Rani's speed was doubled. After how long will they meet for the third time?