1. The problem statement, all variables and given/known data Before charging into my physics teachers office to demand an explanation for my being correct and yet being marked wrong I figured I should try to back up my argument. Kim takes a trip leaving at noon and arriving at 4 pm. Here is the breakdown of her trip: 18 m/s for 3/4 hour, 27 m/s for 3 hours and 11 m/s for 1/4 hour. A) What was her speed at 3 pm? 2. Relevant equations avg speed=distance/time? i guess? 3. The attempt at a solution I have typed everything out exactly as it appeared in my exam (which has been handed back to us, and will not be replicated). I wrote "not enough information" because to the best of my knowledge that questions is asking for instantaneous speed not the average speed. It also doesn't distinctively say, "the trip starts at 18 m/s for 3/4 hrs" etc. etc. maybe she was riding a bus that slowed down and sped up in increments? I don't know..please help! Maybe I'm just misunderstanding the concepts?