exam Maths Puzzle Numerical Ability

What is the derivative of 8x^3/2-12x^-1/2?
Answer is 8/15(5x-2)^3/2. Not sure how they got the answer. Please help.

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exam Other Question

2 buses leave at the same time from 2 terminals 792 km apart and meet in 9 hrs. one travels 8 kph faster than the othe. how far did the faster bus travels I have a parallelogram with 4x in the bottom left corner, 2x in the bottom right corner, and 60 in the top right corner. I need to find the value of each variable in the parallelog