exam Maths Puzzle Numerical Ability

How do you solve this rational expression?
(5X^3)(16X^2)/80X^3.
I have tried doing it on my own, but my teacher did not explain how to do it...

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exam Other Question

solve for a:

16a^4 - 9a^2 = 0 The distance a car can travel on a certain amount of fuel varies inversely with its speed. If a car traveling 50 mph can travel 300 miles on 10 gallons of fuel, how far could the car travel on 10 gallons of fuel at 60 mph?

Thank you