Previous Year NEET Question- Thermodynamics L-2

Question: A cup of coffee cools from $90^{\circ} \mathrm{C}$ to $80^{\circ} \mathrm{C}$ in $\mathrm{t}$ minutes, when the room temperature is $20^{\circ} \mathrm{C}$. The time taken by a similar cup of coffee to cool from $80^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ at a room temperature same at $20^{\circ} \mathrm{C}$ is :#

A) $\frac{5}{13} \mathrm{t}$

B) $\frac{13}{10} \mathrm{t}$

C) $\frac{13}{5} \mathrm{t}$

D) $\frac{10}{13} \mathrm{t}$

Answer: $\frac{13}{5} \mathrm{t}$#