Question 1015052
A boy cyclist and girl cyclist are 10 miles apart and pedaling towards each other. The boys rate is 4 miles  per hour and the girls is 6 miles her hour. A fly is zooming back and forth. If the flies rate is 2 miles per hour, how far will it have traveled when the bikes collide?
----------
The bikers' speeds are added when going in opposite directions.
4 + 6 = 10 mi/hr
-------
d = r*t
t = d/r = 10/10
t = 1 hour.
============
The fly flies at 2 mi/hr for 1 hour --> 2 miles.
===================
PS  Time flies like an arrow.  Fruit flies like a banana.