At Janakpuri west (magenta line) metro station, a boy walks up a stationary escalator in time $t_{1}$ . If he walks up on a moving escalator, then time taken when boy remains stationary on moving escalator is

\frac{t_{1} + t_{2}}{2}

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\frac{t_{1} t_{2}}{t_{1} + t_{2}}

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t_{1} - t_{2}

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\frac{t_{1} t_{2}}{t_{1} - t_{2}}

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Solution

The correct option is B $\frac{t_{1} t_{2}}{t_{1} + t_{2}}$
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