Question 280061
Start a stopwatch when the 2nd car leaves Gander
When I start the stopwatch, the 1st car has a
{{{30*1 = 30}}} mile head start
When I stop the stopwatch, they both will have
driven for the same time, which is {{{3}}} hrs
1st car:
{{{d[1] = 30*3}}}
{{{d[1] = 90}}} mi
2nd car:
{{{d[2] = d[1] + 30}}}
{{{d[2] = 90 + 30}}}
{{{d[2] = 120}}} mi
and
{{{d[2] = r[2]*3}}}
{{{120 = r[2]*3}}}
{{{r[2] = 40}}}
The 2nd car must drive 40 mi/hr to catch the 1st car