Question 408630
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Hi
Let x represent time a trip of 200 miles would take
Question Sets Up a Proportion:
 {{{ 120/3 = 200/x}}}   |cross multiplying to solve for x
  120x = 600
    x = 5 hrs, time a trip of 200 miles would take

CHECKING our Answer***
 120/3 = 200/5 = 40