A train travels 45 m in 3 s. What is the speed of the train in km/h?

A brick wall having a thickness of 24 cm has an inner surface temperature of 25°C and an outer surface temperature of 5°C. The rate of heat loss through per square metre of the wall (thermal conductivity 0.15 J/ (s.m.K)) is:

_____________ is the heat per unit mass required to change a substance form solid into liquid at the same temperature and pressure.

________ is defined as the time rate at which work is done or energy is transferred.

A train travels 45 m in 3 s. What is the speed of the train in km/h?