self Maths Puzzle Numerical Ability Probability

Two people agree to meet between 6pm and 7pm with the understanding that each will wait for no longer than 20 minutes for the other. What is the probability that they will meet?
Ops: A. 1/3
B. 2/3
C. 5/9
D. 4/9

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self Other Question
There are three piles of coins. Pile A consists of one coin, pile B consists of two coins, and pile C consists of three coins. These are to be used in a game played by Anita and Brinda. The game requires that:
i. In each turn a player takes either one coin from a pile or all the coins in a pile.
ii. The player who has to take the last coin loses

Anita plays first. How many coins must she pick and from which pile to ensure her victory?
Ops: A. All coins from pile 2
B. All coins from pile 3
C. One coin from pile 1
D. One coin from pile 2
In how many ways can the letters of the word 'ORANGE' be arranged so that none of the vowels are adjacent to each other?
Ops: A. 144
B. 720
C. 360
D. 576