Two puppies which are 520 feet apart are running towards each other. their speeds are 4 and 5 feet per second. how much time will elapse before they are 250 feet apart from each other?

30 seconds

Step-by-step explanation:

Find the total distance needed to be traveled. 520-250 = 270

Find combined rate. 4+5=9

Divide distance needed to be traveled by combine rate to get answer.

270/9 = 30.

30 seconds

Step-by-step explanation:

The first puppy is running at a rate of 4 feet per second; letting t represent the number of seconds, this is 4t.

The second puppy is running at a rate of 5 feet per second; this is 5t.

In order for them to be 250 feet apart, they would have run 520-250 = 270 feet.

Together their combined distances will be 4t+5t, and it will equal 270:

4t+5t = 270

9t = 270

Divide both sides by 9:

9t/9 = 270/9

t = 30

It would take 30 seconds.

The first puppy would travel 4(30) = 120 feet, and the second puppy would travel 5(30) = 150 feet; this is a total of 120+150 = 270 feet.  This leaves them 520-270 = 250 feet apart.

answer: 298143

step-by-step explanation:

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies