what is the answer to this ?

Question

when an amusement park opened,the counter on the turnstile at the entrance read 1278. 7 hours later,the counter read 3672.

Answer 1

First we find the total change and then we divide by the time.  We subtract the final count from the intial number to find the total change.  When the park opened the turnstyle read 1278 and 7 hours later the count read 3672 so we have 3672-1278= 2394.  Now we take the difference and divide it by our units of time, in this case 7 hours.  2394/7= 342.  Using this we know that there are 342 people going through the turnstile per hour. 

Answer 2

you did not specify the question, but I'm guessing it's "How many people entered the amusement part on average per hour"
Here's how this problem is done:
You first need to figure out the total number of people that entered the park in those seven hours. To do that, you subtract 1278 from 3672, so:
3672-1278=2394
Now, in order to figure out how many people per hour Entered in those 7 hours, you just take the number of total people that entered (2394), and divide by the number of hours (7), so:
2394/7=342. That's your answer!