A mechanic can install carburetors in 3 cars every 4 hours. At
that rate, how long will it take the mechanic to install
carburetors in 5 cars?
A. 6 hr. 20 min.
B. 6 hr. 40 min.
C. 7 hr. 15 min
D. 7 hr 30 min
E. 7 hr. 45 min

B. 6 hr. 40 min

Step-by-step explanation:

In the question is it said that a mechanic can install carburetors in

3 cars = 4 hours

How long with it take of install carburetors in 5 cars

We have

3 cars = 4 hours

5 cars = X (unknown so we designated it as X)

We cross multiply

3X = 4× 5

3X = 20

Divide both sides by 3

Hence, we have

3X ÷ 3 = 20÷ 3

X = 6.667 hours

In other to convert 6.667 hours to proper time i.e in hours and minutes ,

We have

1 hour = 60 minutes

0.667 hours = y( unknown so we represent with y)

Cross multiply

y = 60× 0.667 hours

y = 40.02 mins.

Approximately ≈ 40 mins

Therefore we add 6 hours + 40 mins

= 6 hours 40mins

Therefore, will it take the mechanic 6 hours 40 minutes to install carburetors in 5 cars

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.