<img alt=" />Am I missing something vital? I see distance-time graph questions frequently: in text books, and in exams. The y-axis represents "distance from" somewhere. Eg. Edexcel Specimen Higher Paper 3 http://www.edexcel.com/migrationdocuments/Current%20GCSE/320326_Unit_3_Higher_section_A_Nov_2007.pdf<img alt=" /><img alt=" /><img alt=" /> Sian travels to a shop and home again. There is a marvellous representation of a travel graph. We all know what the graph is MEANT to represent, but there are many interpretations, aren't there, other than the supposed 'correct' answer? Why are the graphs not more accurately defined? In the above question, the answer to the first part is expected to be 8km in 10mins is 48km/h. But what if this journey was on a road spiralling away from her house, and she'd actually covered 20km to reach a position 8km from her home? Half an hour into her journey, we are expected to say that Sian is stationary at the shop for 15 minutes. An equally likely situation is that she is on the ring road for 15 minutes, maintaining a distance of 20km from her house. Who knows what her speed is at this time? Finally, to complete the travel graph, I could draw ANY of several different lines, straight or otherwise and argue that each could fulfill correctly the specified 60km/h requirement.