exam Maths Puzzle Numerical Ability

If a car travels 20 km per hour between two cities. How fast must the car travel to average 40 km per hour for the round trip

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exam Other Question

I'm not sure how to solve these problems:
-7(√18)-5(√200)-3(√162)

7x^3/7
My Work:
(^7√7x)^3= x^3?

(√p^2-5p+9)= p-2
My Work:
(√p^2-5p please help!

why do intersecting lines represent a unique solution? give examples to support your answer.