Identify relevant information, ignore distractors, and choose an appropriate operation or representation for a contextual problem.
Judge whether enough information is given
Problem
A family drives to a park \(180~\text{miles}\) away, leaving at \(9:15~a.m.\) without stopping. The car gets \(28~\text{miles}~\text{per}~\text{gallon}\). Can their arrival time be determined? If not, what key information is missing?
Big Picture
What this problem is really about
Audit the dependency chain before trying to calculate: arrival time needs departure time plus travel duration, and travel duration needs distance divided by a driving rate. Check the units of every supplied rate against that need. Miles per gallon relates distance to fuel, not distance to hours, so it cannot fill a miles-per-hour role.
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