Salutations!
Number of people Noah visited = 40
Number of hours taken = 4
Number of hours taken to visit 120 people -----
You need to cross multiply
40 people = 4 hours
120 people = ?
[tex]120*4/40[/tex]
[tex]120*4 = 480[/tex]
[tex]480/40=12[/tex]
It took Noah 12 hours to meet 120 people
Hope I helped (:
Have a great day!