Answers to "Math" quiz

1. The heights are 70 in., 72 in., 74 in., 80 in.

2. Twenty-six minutes

3. 4 boys 3 girls

4. The train travelling against the spin of the earth because centrifugal force on this train is less.

5. t=d/average speed then t=d/40 and d/25, d/40 + d/25 = 13d/200 = 2d/ 13d/200 =2d*200/13d = 400d/13d = 30 10/13

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