UP Police Constable 19-June-2018 Shift 1 Solved Paper

Sathi and Rathin invested some money in a business in the ratio 6 ∶ 5, but Sathi withdrew her money after a few months. If the end-of-twelve-months' profit was shared between Sathi and Rathin in the ratio 7 ∶ 10, for how many months did Rathin alone invest?