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Formation of Algebraic Expressions

A wrist watch...

Question

A wrist watch loses $10$ sec in every $8$ hours. In how much time in hours will it lose $5$ sec?

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Solution

$10$ secs $= 8$ hours
$\frac{10}{2}$ secs $= 5$ secs
$\frac{8}{2}$ hours $= 4$ hours
It takes $4$ hours to lose $5$ seconds.

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