book Maths Puzzle Numerical Ability

i thought it was 4/14 but i was wrong...Which of the following is not a fractional representation for 2/7..




6/21

4/14


8/18


4/21

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book Other Question
James' average driving speed is 22 kilometers per hour faster that Lars'. In the same length of time it takes James to drive 616 kilometers, Lars drives only 462 kilometers. What My question says to solve the system of this inequalitie by graphing.
x+y>4
-3x+y<-1

I dont know how to solve this or graph it. could you help me?
thanks