At an airport, a moving walkway 70 m long runs at 2.0 m/s. A boy walks at 1.5 m/s relative to it, **against** its motion. How long does he take to get from one end to the other?

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At an airport, a moving walkway $70\ \text{m}$ long runs at $2.0\ \text{m/s}$ . A boy walks at $1.5\ \text{m/s}$ relative to it, against its motion. How long does he take to get from one end to the other?

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