(Strip Number 195, Original Publication Date, 14 November 1981)
Panel 1: We start things off with Mike and Elly, who are wearing jackets because it's late autumn, standing next to a tree looking to their left. Mike's mildly confused and Elly slightly bemused.
Panel 2: Elly looks down at Mike with the same Deadpan Expression of Mild Irritation as he asks "Mom?"
Panel 3: We shift perspective to see what they're looking at: Lizzie on a tricycle. Since she's got small legs, she can't pedal very fast so she's about ten to twenty yards behind them; since Elly's sort of frustrated because her super great idea was super wrong, she's really irritated when Mike says "I thought you said we'd be able to walk faster if Lizzie brought her bike."
Summary: Why did Elly think that Lizzie would be any faster if she pedaled? Small legs that can't run as fast as Mommy would like aren't going to be able to pedal fast enough to please someone perfectly capable of looking down at a three-year old and petulantly asking "Can't you walk??!!" I know it's frustrating to have to limit one's self to how fast a child moves but, well, that's the deal with walking with kids. The slowest person sets the pace.