Weiland Period One Related Rates Problem: Logan and Patience

Patience and Logan go into calc class praying that they won`t have a pop quiz. Mr. Weiland, is looking at the clock an awful lot and both girls know what is coming. When Mr. Weiland announces the pop quiz, Logan crying gets up and runs out of the room heading north at six ft/sec. One second later Mr. Weiland chases her and is heading north at six point seven ft/sec. A. Find the rate of change between Logan and Mr. Weiland after Logan has been running for ten seconds. B. Logan starts running east at seven ft/sec to avoid getting caught. Mr. Weiland continues running north at six point seven ft/sec. How fast is the distance between Logan and Mr. Weiland changing five seconds after Logan starts running east? C. Logan starts to head north and Mr. Weiland hearing her footsteps down the hallway, starts to head east in order to intersect her. How fast is the distance between them decreasing after three seconds?