A cup of coffee cools from 90° C to 80° C in t minutes, when the room temperature is 20° C. The time taken by a similar cup of coffee to cool from 80° C to 60° C at a room temperature same at 20° C is - a. 5/13 t b. 13/10 t c. 13/5 t d. 10/13 t

By solving both the equations

t' = 13t/5

Therefore, the time taken for a similar cup of coffee to cool from 80° C to 60° C at room temperature the same at 20° C is 13t/5.

Summary:

A cup of coffee cools from 90° C to 80° C in t minutes, when the room temperature is 20° C. The time is taken for a similar cup of coffee to cool from 80° C to 60° C at a room temperature same at 20° C is -

1. 5/13 t

2. 13/10 t

3. 13/5 t

4. 10/13 t

A cup of coffee cools from 90° C to 80° C in t minutes, when the room temperature is 20° C. The time taken by a similar cup of coffee to cool from 80° C to 60° C at room temperature the same at 20° C is 13t/5.

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