85. The Fly and the Cars. The length of the road is 300 km. Car $A$ starts at one end of the road at noon and moves at a constant speed of 50 km/h. At the same time, at the other end of the road, car $B$ starts at a constant speed of 100 km/h and a fly, flying at 150 km/h. Upon meeting car $A$, the fly turns and flies towards $B$.
1) When will the fly meet $B$?
2) If, upon meeting $B$, the fly turned, flew towards $A$, met him, turned again, and continued flying back and forth between $A$ and $B$ until they collided, when would the cars crush the fly?
85. 1) The fly will meet \(B\) in 1 hour 48 minutes.

2) There is no need to determine the distance the fly will fly. This is too difficult a task. Instead, we can simply find the time when the cars could have collided, which is 2 hours. In reality, the fly flies (in kilometers):

\[
\frac{270}{1}+\frac{270}{10}+\frac{270}{100}+\frac{270}{1000}+\cdots \text { to infinity; }
\]

the sum of this infinite decreasing geometric progression is 300 km.