A cup of coffee cools from 90^0 C to 80^...

A cup of coffee cools from `90^0 C` to `80^0 C` in t minutes when the room temperature is `20^0 C`. The time taken by a similar cup of coffee to cool from `80^0 C` to `60^0 C` at a room temperature same at `20^0 C` is

`(10 t)/13`

`(5 t)/13`

`(13 t)/10`

`(13 t)/5`

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