exam Maths Puzzle Numerical Ability

GIVEN: AB=BC,AD=DE,BC=AD
PROVE: DE=AB

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exam Other Question

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 x+y_<2 or y_>3