Byun walked 15 blocks in 25 minutes what is the average speed of the bus in kilometers per hour

The average speed of Byun is, 3.6 km/h

Explanation:

Given data,

The distance walked by Byun, d = 15 block

Let 1 block be 100 m

Therefore total distance walked by Byun, d = 1.5 km

The period of travel t = 25 minutes

                                  t = 0.42 h

Therefore, the average speed of Byun,

                                       s = d / t

                                           = 1.5 km/ 0.42 h

                                           = 3.6 km/h

Hence, the average speed of Byun is, 3.6 km/h

c.is a substance that requires a small amount of energy per gram to raise its temperature; has strong cohesive forces between molecules.

explanation:

a colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =