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Mathematics

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A boy is three years than his sister. Three years ago he was two-thirds of his sister's age.What are their present ages?

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Today at 10:49 AM

Answer: boy 9 years

Girl 3 years

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Today at 10:48 AM

Answer:Boy 9 years
Girl: 3 years

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2. A race car accelerates from rest at a constant rate a for t₁=5.0sec, and then decelerates at a₂ = 5m/s² for t₂ =10sec, after which the car is going v₂ = 5m/s

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