There is insufficient information in this problem to solve it.Originally Posted by babygirl
If this was my problem I would look up in my text book or do a google search
for the altitude dependence of air pressure (giving priority to my text book
or what I have been told by my teacher).
There I might find air pressure drops by about 1 part in 1000 for every 8m
increase in altitude, for altitudes of less than a few hundred metres.
Alternatively you might find that the half height of the atmosphere for air
pressure is ~5000m
We really need to know what you are supposed to know about atmosheric
pressure before we can help you with this question.