The formula for rate is rate distance/time. Your answers to these questions are correct if you express how many centimeters (cm) of movement accur in one year (yr), or in other words cm/yr. If you get a number that has a lot of zeroes either to the right or left of is decimal point, it's not correct For example, if I want to figure out the rate of plate movement from 5.1 million years ago (the center of Kaual) to 3.7 million years ago (the southern coast of Canu), my equation would be rate 16,000,000cm/2,000,000yr 8.00 cm/yr What is the approximate rate in cm/yr of plate movement from 5.1 million years ago to 1.9 million years ago?