5. Sally Drives 120 km for 1.5 hours, rest for 0.5 hours and finishes her trip by driving an additional 80 km in 1 hour. What was her average speed during her car trip in
km/hr?

answer; i do believe the correct answer is (river); /// good luck

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.

i'm assuming that the correct answer is indeed the first one/ "a"..

the answer your looking for is c).