Answer:
a. 70° F b. 0.17min
Step-by-step explanation:
The fahrenheit scale to time can be given with the following mathematical relation

f2=?
f0=10° F
f1=40° F
t2=1min
t0=0
t1=1/2min


f2-10=60
f2=70° F
b. Goin by the previous relation


30/10=0.5/t0
30t0=5
t0=1/6
t0=0.16666666666666666666666666666667
t0=0.17min
from this, it can concluded that temperature outside increases with time