Which sentence best describes Earth's rotation?

A. Earth rotates on its axis once every two days.
B. Earth rotates on its axis once every year.
C. Earth rotates on its axis once every 24 hours.
D. Earth rotates on its axis twice every 24 hours.

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?