book Maths Puzzle Numerical Ability

Help Please! I've been working on this for hours and I can't seem to get it.

Bus leaves for vegas 1t 5 PM, distance is 270 miles

Next day bus leaves for same trip, but late,

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book Other Question

Solve for x, y, and z in the following system of equations.

x + 2y + z = 2
5x = z
y = -2x

Any help is appreciated. Thank you in advance! Suppose that you have a supply of a 30% solution of alcohol and a 70% solution of alcohol. How many quarts of each should be mixed to produce 20 quarts that is 40% alcohol?