Tag: science & technology

A motorist wishes to travel 40 kilometers at an average speed of 40 km/hr. During the first 20 kilometers, an average speed of 40 km/hr is maintained. During the next 10 kilometers, however, the motorist goofs off and averages only 20 km/hr. To drive the last 10 kilometers and average 40 km/hr, the motorist must drive

Suppose in a restaurant your coffee is served about 5 or 10 minutes before you ask for it. In order that it should be as hot as possible when you drink it, should you pour in the room temperature cream right away or when you are ready to drink the coffee?

A piece of iron has a temperature of 10°C. A second identical piece of iron is twice as hot. What is the temperature of the second piece of iron?