exam Maths Puzzle Numerical Ability

Solve the system by addition

2x-4y=7

4x+2y=9

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exam Other Question

How do I solve this problem? Can You discover the lodgical pattern for each number sequence below and therby discover the missing number(shown by dash)?
FOR EXAMPLE in a bicycle race, lionel gives robert a 500m advantage. also, lionel agrees to start 15 min after robert. if lionel bikes at 17 km/h and robert at 14 km/h, how long will it take lionel after he starts to overtake robert?

thanks in advance