Question 229288
4x+1x=20,320
5x=20,320
x=20,320/5
x=4,064 sec. after they start they will meet.
1*4,064=4,064 feet is the meeting altitude.
Proof:
4*4064=16,256 feet below the peak.
16,256+4,064=20,320
20,320=20,320