<PRE><B>Question 788137</B>
Their rates will tell you how fast the distance between them decreases.  This value is {{{70-55=15}}} km/h.


Drawing a position graph for this is not so easy on this system algebra site, but going straight to part #b:
{{{15*x=35(1/1000)}}}
{{{x=(1/1000)35/15}}}
{{{x=(1/1000)7/3}}}
{{{x=2.33333/1000}}} hours
{{{x=0.002333}}... hours


This is {{{0.0023333*60*60=8.4}}} seconds
Eight and four-tenths seconds</PRE>