exam Maths Puzzle Numerical Ability

2 cars start from the same place and time, traveling in opposite directions, one averaging 65km p/h, the other 90km p/h. After how long will they be 450km apart ?

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solve and check please..

-6x+2-2(x+1)=6x+6 Please someone help...I've been trying to figure where I'm going wrong....I get almost to the end and my last fraction is always wrong...so I'm not multiping somewhere right....