Atrain travels some distance with a speed of 30km/h and returns with a speed of 45km/h. calculate the average speed of the train.

Average speed = total distance / total time

= (30+45) km / 2hr

= 75 / 2

= 37.5 km/hr is the average speed of the train.

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is

get the total number of pieces of fruit and divide it by 4 to get the average. the result is the answer to the problem. 14 total number of fruits and there are 4 members. 14 divided by 4 is equals to 3.5.