Answer:
B. 6 hr. 40 min
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