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Mahavira (850 A.D.)

In the course of 3/7 of a day, a ship goes over 1/5 of a Krosa in the ocean, being opposed by the wind she goes back (during the same time) 1/9 of a Krosa. Give out, O you who have powerful arms in crossing over the ocean of numbers well, in what time that ship will have gone 99 2/5 yojanas?


Source: R. McGinty & J. Van Beynen's "Story Problems--Let's Make Them Just That," SSAM (April 1982)