<PRE><B>Question 911487</B>
Two trains are travelling towards each other from 200 miles apart on the same track: Train A travels at 30 miles per hour, Train B travels at 70 miles per hour. At the same time, a robotic bee buzzes back and forth between the trains at a speed of 150 miles per hour. How far will the bee travel, in total, before the trains collide

Two trains are travelling towards each other from 200 miles apart
Train A travels at 30 miles per hour, 
Train B travels at 70 miles per hour.

travelling towards each other so combined speed = 70+30 = 100 mph
 
t=d/r
Time taken by trains to meet = 200/100 = 2 hours

a robotic bee buzzes back and forth between the trains at a speed of 150 miles per hour.

D= r*t

= 150*2 = 300 miles


 the bee will travel 300 miles , before the trains collide</PRE>