Respuesta :
Levi's dad takes time to wash the car by himself is 1.667 hours which is 1 hour and 40 minutes.
What are ratio and proportion?
A ratio is an ordered couple of numbers a and b, written as a/b where b can not equal 0. A proportion is an equation in which two ratios are set equal to each other.
Washing his dad's car alone, eight-year-old Levi takes 2.5 hours. If his dad helps him, then it takes 1 hour.
Levi's dad take time to wash the car by himself will be
We know that the time is inversely proportional to the work.
Let tâ is the time taken by Levi and tâ is the time taken by Levi's dad.
We know that the formula
[tex]\begin{aligned} \dfrac{1}{t_1} + \dfrac{1}{t_2} &= 1\\\\\dfrac{1}{2.5} +\dfrac{1}{t_2} &= 1\\\\\dfrac{1}{t_2} &= 1 - \dfrac{1}{2.5}\\\\\dfrac{1}{t_2} &= \dfrac{3}{5}\\\\t_2 &= \dfrac{5}{3}\\\\t_2 &= 1.667 \end{aligned}[/tex]
Levi's dad takes time to wash the car by himself is 1.667 hours which is 1 hour and 40 minutes.
More about the ratio and the proportion link is given below.
https://brainly.com/question/14335762
