exam Maths Puzzle Numerical Ability

Mary and Lucy both leave from the same bus station. Mary drives 10mph slower than Lucy. In three hours, the are 260 miles apart. How do you set up an equation to solve?

~Confidently Confused~

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exam Other Question

Question from the textbook is:
In exercises 51-54,use a graph to determine all values of x,such that the expression has the given value in parts (a)-(d).
53: (a) -22 (b) -1 Use the given root to find the solution set of the polynomial equation.

x^4 - 21x^2 - 100 = 0

Root = 2i