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2. Alvin runs 2 km to the bus stop, and then rides the bus 4.5 km to school. On average, the bus is 45 km/h

2. Alvin runs 2 km to the bus stop, and then rides the bus 4.5 km to school. On average, the bus is 45 km/h faster than Alvin's average running speed. If the entire trip takes 25 min, how fast does Alvin run? (4 marks)

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