exam Maths Puzzle Numerical Ability

Ricky can install a basic security system in 4 hours. If it takes Ricky and Mark 2 hours working together to install this system, how long does it take Mark working alone?

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exam Other Question

Two points P and Q lie on opposite sides of a line L. Find on L the point A for which the difference AP-AQ is the largest. Show the proof. Give the 8th term in the sequence.
6 1/6 , 6 1/3 , 6 1/2

A. 6 2/3 B. 6 5/6 C. 7 D. 7 1/3