exam Maths Puzzle Numerical Ability

Solve the equation:

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

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exam Other Question

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? Simon arrived at work at 8:15 A.M. and left work at 10: 30 P.M. If Simon gets paid by the hour at a rate of $10 and time and � for any hours worked over 8 in a day. How much did Simon get paid?