book Maths Puzzle Numerical Ability

John is traveling to a meeting that is 28 miles away. He needs to be there in 30 minutes. How fast does he need to go to make it to the meeting on time?

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i forgot what the algebraic method was...here is my equation to solve...

x-y=3
-2x+2y=-6

thank you.... Why does a positive integer multiplied by a negative integer equal a negative integer? I need the answer by monday.