There are two groups of people, three in each, for painting a wall. The
numbers that follow express the time in hours) spent on painting. In
Group A, Alex 2.5, Adam 3.6, and Antimo 4.7. In Group Z, Zairo 2.2, Zeno
3.2, and Zubro 4.9. Estimate the total time for groups A and Z when all
three workers in each group work together. Which group can paint the
wall faster and why do you think so? (Your answer is: two numbers and
one sentence where you will explain your reasoning) *