Question 534147
Let's assume the fawn will run directly away from the cougar, and the cougar will follow, both running on the same straight line trajectory.
The distance (in meters) between them will shorten every second by
{{{18-11=7}}}
At that rate, the time in seconds for the distance to become zero is
{{{132/7=18.86}}}
The decimal above is not exact. If you want to express it as an exact number, you'll have to write it as 18 6/7.