exam Maths Puzzle Numerical Ability

problem is found on page 130 #50 of the book listed above

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exam Other Question

If y varies directly with x, and y=400 when x=1000, find the constant of variation k. Judith rides her bike 2 mi/h faster than Kelly. Judith takes 48 minutes less to travel 50 mi/h than Kelly. What is each person's distance in miles per hr?

This is in the chapter