Question

7. An intersection starts getting traffic at

8:00 AM, and then closes for construction
from 1:00 PM to 2:30 PM. While the
intersection is open, cars pass through
at a rate of 32 cars each hour. How
many cars pass through the intersection
between 8:00 AM and 5:00 PM?
©
©
288 cars
240 cars
320 cars
128 cars

Answer 1

240 cars pass through the intersection between 8:00 AM and 5:00 PM

Explanation:

The rate of cars passing = 32 cars each hour

The traffic starts at 8: 00 AM and it goes on till 1:00 PM.

So, the number of hours, the traffic flows = 5 hours ..... (1)

The intersection is then closed till 2: 30 PM

After opening, the traffic flows from 2:30 PM to 5 PM

So, the number of hours, the traffic flows = 5 PM - 2: 30 PM hours

= 2 . 5 hours ..... (2)

So, the Total number of hours traffic flows is

= 5 hours + 2 . 5 hours = 7. 5 hours

Now, the cars passing each hour = 32 cars

⇒ The cars passing in 7.5 hours = 7.5 x (32 cars)

= 240 cars

Hence, 240 cars pass through the intersection between 8:00 AM and 5:00 PM