Posted by Anonymous on .
Two Planes approach each other headon. One plane has a speed of 800 km/h and the other has a speed of 900 km/h and they spot each other when they are initially 15 km apart. How much time in seconds do the pilots have to take evasive action?

Physics 
Damon,
they are headed toward each other at
(800+900) /(3600) km/s
= .4722 km/second
15 km = .4722 t
t = 31.8 seconds