You just competed in a track meet and you ran the 1500 m race in 484 seconds. what was your average speed in miles per hour?

484/3600 = 0.134 hours

1500 meters = 4921.26 feet

there are 5280 feet per mile

4921.26/5280 = 0.932 miles

0.932/0.134 = 6.95 miles per hour

 round answer as needed

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 =