vcaa 2009 help

[nooshnoosh95]

btw this is question 4
for part e)i.
the answer is 14-t
like i get 6+8=14
but why is it 14-t when its not coming down at 1m per hour
like 2 hours later its not 12m high
or is it??


i got it dw lol it is coming down at 1m per hour