Answer:
16
Step-by-step explanation:
convert 40 minutes to hours
[tex] \frac{40 \: minutes}{1} \times \frac{1 \: hour}{60 \: minutes} = \frac{40}{60} = \frac{2}{3} hour[/tex]
multiply to find the number of cars per hour
[tex] \frac{2}{3} \times \frac{6}{1} = \frac{12}{3} = 4 \: cars \: per \: hour[/tex]
multiply again
[tex]4 \times 4 = 16[/tex]
