A pendulum clock is 5 sec. Slow at a te...

A pendulum clock is 5 sec. Slow at a temperature `30^(@)C` and `10` sec. fast at a temperature of `15^(@)C`, At what temperature does it give the correct time-

`18^(@)C`

`20^(@)C`

`22^(@)C`

`25^(@)C`

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