book Maths Puzzle Numerical Ability

What is the sum of the infinite geometric series with a1 = 27 and r = -4/5?

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book Other Question

This is a yes or no question. Determine if the line through P1 and P2 is parallel to the line through Q1 and Q2.

P1(2,1), P2(3,4); Q1(-2,1), Q2(2,2) Two cyclists begin traveling in the same direction on the same bike path. One travels at 20mph and the other at 14 mph. after how many hours will they be 15 miles apart?