Question 1168100
 Altitude(A) = 5000ft + 45.25ft/sec * t
 Altitude(B) = 4748ft + 50.5ft/sec * t<br>
They will be at the same altitude when the two equations are equal:

4748 + 50.5t = 5000 + 45.25t<br>

Solve for t:  t=<b>48sec</b>
Plug t=48 into (A) or (B):  Altitude(B)=<b>7172ft</b>