exam Maths Puzzle Numerical Ability

simplify:

3/x + 1/x+4 divided by 1/x + 3/x+4

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exam Other Question

find the equation that is perpendicular to line AB and line CD and goes through the midpoint Daphne and Niles are both driving west on Route 66. At 4:00pm, Daphne is 5 miles west of Niles. A little later, Niles passes Daphne. If Niles is driving at 55 mph and Daphne at 50 mph, at what times does Niles pass Daphne?