exam Maths Puzzle Numerical Ability

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?

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problem is found on page 130 #50 of the book listed above I bought 2 donuts and 3 lattes yesterday for $6.15, today I bought 3donuts and 4 lattes for $8.35, how much are donuts and how much are lattes? I got latte would be 1.75 donuts .45 am i right?