exam Maths Puzzle Numerical Ability

Mr. Max and Mr. Min start off in the same place and head in opposite directions. Mr. Max is traveling at 60 miles per hour and Mr. Min at 55 miles per hour. How long will it be before the two are 345 miles apart?

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please help me understand:

explain how to apply substitution in solving a system of equations.

Thank you. what is an equation i can use for the following table:

rows------flowers
4----------32
6----------48
8----------64
10---------80