Well you did not say how many miles you are from Michigan
Distance=speed*time
Distance covered from home to airport= 70*3=210 miles
Distance covered from airport to destination= 350*2= 700 miles
Total distance covered= 910 miles
X=11 is the answer right?
It would be 42.8
How I got this answer :
Every thousand feet is 2.1 and then times that by 12 giving you 25.8 ( 2.1 x 12 = 25.2)
So now you will get the original temperature (68.0) ( 68.0 - 25.2 = 42.8)
And thats your answer