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 t₁ is the time taken by Levi and t₂ 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
