exam Maths Puzzle Numerical Ability

A car traveled for 1/2 hour at r mi/h, then increased the speed by 10 mi/h and traveled for 1 1/2 hours more. How far did the car go? (Express the answer in terms of r)

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Can you please help me solve this problem:

1.) A teacher is 15 years older than her student. In 15 years, the ratio of their ages will be 3:2. Find their present ages.
35. Not involving y in expression of ( [1/y3) + y2]

(****Please note the first y is to the power of 3 and the second y is to the power of 2****)

Thank you in advance!