You can write it as a proportion and then solve the proportion.
(2.5 hours is 150 minutes)
14 cars x cars
--------------- = -------------------
45 minutes 150 minutes
Then solve.
x=46.6666666
So that is about 47 cars
Exactly half of these integers are odd (1, 3, 5, ..., 29) so the probability of selecting an odd number is
.
Left column. Right column
6m. 6x10^0m
120,000m. 12x10^4m OR 1.2x10^5m
0.0012m. 12×10^4m OR 1.2×10^-3m
300m. 3×10^2m
0.6m. 6x10^-1m
0.0009m 9x10^-4m
6000m. 6x10^3m
