A car travels 50 km in 1 hour and 15 minutes. What was the car’s average speed?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Atemperature inversion can cause a warm air mass to move over a colder air mass. this traps the colder air mass and prevents surface air from rising. this may result in which of these? a) smog b) acid rain c) freezing rain d) a thunderstorm

Happiness is to senipah as 517768399 is to what?