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A person climbs up a stalled escalator in 60 s. If standing on the same but escalator running with constant velocity he takes 40 s. How much time is taken by the person to walk up the moving escalator?

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\begin{array}{l} \vec{v}_{m}=\vec{v}_{m e}+\vec{v}_{e} \\\\ v_{m}=\frac{l}{60}+\frac{l}{40} \\\\ \frac{v_{m}}{l}=\frac{100}{2400} \Rightarrow t=24 \mathrm{sec} \end{array}

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lovekush

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