exam Maths Puzzle Numerical Ability

Please help with this problem
The complex numbers 2/5xi + 3 and -4 - 1/4yi are equal. Find the values of x and y
Have tried solving as a regular equation but cannot find equal values.

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What exactly is a discrimanent? (sorry about the spelling) Question

If the minute hand of a big clock is 1.12 m long, find the rate at which its tip is moving in centimeters per minute.

Please help and thanks a lot.