A body in a room cools from 90°C to 80°C in 5 minutes. The time taken to cool from 70°C to 60°C is?

Less than 5 minute

5 minute

More than 5 minute

Less or more than 5 minutes depending upon the nature of the body

The rate of cooling of a body is typically faster at higher temperatures and slows down as the temperature difference between the body and its surroundings decreases. This behavior is governed by Newton's law of cooling.
Given that the body cools from 90°C to 80°C in 5 minutes, we can infer that the rate of cooling will be slower when the temperature difference is smaller, such as when cooling from 70°C to 60°C.