Question

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. $\frac{5}{13}t$
• B. $\frac{13}{10}t$
• C. $\frac{13}{5}t$
• D. $\frac{10}{13}t$

Answer 1

Answer: (C)

$\frac{13}{5}t$

Answer 2

The correct answer is option (C): $\frac{13}{5}t$