If you traveled 100 miles in 5 hours what is your speed

20 MPH (miles per hour)

Explanation:

You do miles / time (miles divided by time) to calculate the average speed!

Hope this helped ^^

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.