book Maths Puzzle Numerical Ability

how long does it take a automobile traveling 71.4km/h to become even with a car traveling in another lane 61.4km/h if the cars front bumper s are initially 125m apart? answer in units of s

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not sure if this is the ectin I need to post this question but here goes.


I have been racking my brain for several hours now as to how to set this problem up.
You own a smal factor x2+4xy+4y2-16

factor 12(x+1)2-17(x+1)+6