Independent variable on x-axis (value you can choose)
dependent variable on y-axis (corresponding value for the value you have chosen)
You can the hours and the distance traveled is a function of those hours.
also, I'd go in increments of 5. More accurate than increments of 15. The answer is D! <span><span> Hope this helps!</span></span>
To find the contribution of each man (this is a sexist problem as women could work as well, but that’s besides the point) take 5/2 and then multiply that value by 20 and you’ll find it takes 50 hours for two men to do it.