exam Maths Puzzle Numerical Ability

I need help with another problem please help.
Martin leaves home at 9 a.m. bicycling at a rate of 24mi/hr.Two hours later,John leaves,driving at the rate of 48mi/hr.At what time will John cath up with Martin?

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exam Other Question
What is the equation in slope intercept form of the line that goes through the coordinates of (-4,6) (8,12)? Solve the equation:

3/4x+7/x=4/x-3