A pendulum clock (fitted with a small he...

A pendulum clock (fitted with a small heavy bob that is connected with a metal rod) is `5` seconds fast each day at a temperature of `15^(@)C` and `10` seconds slow at a temperature of `30^(@)C`. The temperature at which it is designed to give correct time, is

`18^(@)C`

`22^(@)C`

`20^(@)C`

`25^(@)C`

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