exam Maths Puzzle Numerical Ability

Solve the equation:

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

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exam Other Question

This one really has me stumped. My training guide has a graph but I cannot figure out which answer is actually displayed in the graph. if you could please graph the following, it w an airplane takes off from an airport at 7:00 A.M. traveling at a rate of 350 mi/h. two hours later, a jet takes off from the same airport following the same flight path at 490 mi/h. in how many hours will the jet catch up with the airplane?