exam Maths Puzzle Numerical Ability

I dont understand Algebra can u explain algebra in laymen terms so i can understand.

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6/13 of the athletes could complete the obstacle course. If 14 of the athletes could not complete the course, how many could complete it? fred begins walking toward johns house at 3 mi/h. john leaves his house at the same time and walks toward freds house on the same path at a rate of 2 mi/h. how long will it be begore they meet if the distance between the houses is 4 miles?