exam Maths Puzzle Numerical Ability

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....

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exam Other Question

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 ? 5b/3a^2c - 4/3c^2

(Find each sum or difference)