On a residential single lane road there was a wreck that backed
up
traffic for 6 miles. 60% of the traffic consists
of cars and 40% of the traffic consists of trucks.
The average distance between vehicles is 3 feet.
Theaverage length of a car is 13.5 feet and the average
length of a truck is 20 feet. Estimate how many vehicles
are stuck in the traffic jam.
(Hint: There are 5280 feet in 1 mile)

a.340
b.504
c.1152
d.1703