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A boy cycles x km at 8 km/hr and y km at...

A boy cycles x km at 8 km/hr and y km at 20km/hr. His tota;l time is 3.5 hours. The total time taken to cycle (2x+4)km at 8km/hr and `y/3` km at 20 km/hr is 5 hours. Find x and y

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