Two Trains,one Travelling at 20 M/s and the Other at 40

Multiple Choice

Two trains,one travelling at 20 m/s and the other at 40 m/s,are headed toward one another along a straight level track.When they are 950 m apart,each engineer sees the other's train and applies the brakes.Assuming both trains have equal magnitude accelerations after the brakes are applied,determine the minimum magnitude of this acceleration in order to avoid a collision.

A) 1.62 m/s²
B) 0.87 m/s²
C) 3.45 m/s²
D) 1.05 m/s²
E) 2.15 m/s²