exam Maths Puzzle Numerical Ability

Please help me solve this: Clifford "TI" Harris went on a weekend trip. He averaged 35mi/h in the city and 60mi/h on the highway. If the 150mi trip took 3hrs, how much of the time was he driving in the city.

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exam Other Question
An objective function is to be maximized given the following constraints: x + 2y<- 4, x - y <-1, x >- 0, y >- 0. Find the vertices of the set of feasible solutions. i can factor most of them down i just cant get this one.
54b+2a^3b