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Mathematical problems of one-step method
Solution: tire circumference = 70x3.14 = 219.8cm.

Distance traveled by bicycle per minute = 219.8x100 = 21980cm = 219.8m.

2 km =2000 m

2000÷2 19.8≈9.099 minutes ≈ 10 minutes (used here)

It takes him about 10 minutes from home to school.

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