Jenna can clean the gutters at her house in four hours. her older brother, john, can clean the gutters in three hours, if they work together, exactly how long would it take them to clean the gutters?

1 hour and 42.8 minutes

Step-by-step explanation:

To answer this question let's call while it takes Jenna to clean the gutters

Let's call while it takes John to clean the gutters

h

h

t = total time

g = job = 1 (clean the gutters)

The speed of each one is:

g/ h

g/h

So:

h

Then, both together paint of gutters for each hour.

This means that it takes  hours to clean the gutters together

Finally cleaning together takes 1,714 hours or also

1 hour and 42.8 minutes

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.

x = -2

y = 848

step-by-step explanation:

plug in the numbers