Speed of boat and river are in the ratio of 5:3 in still water. Ratio of 2 different distances in river is 10:13. If these distances are covered upstream and downstream respectively, what is the ratio of time taken?

40:13

Time = \(\frac{Distance}{Speed}\)

ATQ, Down stream speed (D.S) = 5 + 3 = 8

upstream speed (U.S) = 5 - 3 = 2

Required time = \(\frac{10}{2}\) : \(\frac{13}{8}\) = 5 : \(\frac{13}{8}\) = 40 : 13