exam Maths Puzzle Numerical Ability

The difference of 2 numbers is 4. The difference between their reciprocals is 4/21. Find the 2 numbers

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Please help me solve this problem:

An elevator went from the bottom to the top of a 240 meter tower, remained there for 12 seconds, and returned to the bottom in an elapsed time
Solve for x and y.
5x+(y-3)i=x-4+6yi