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Definition of Functions

Then how much...

Question

Then how much time would it take him to walk up the moving escalator?

A

\frac{l}{t_{2}}

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B

\frac{l}{t_{1}}

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C

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

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D

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

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Solution

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