Question

Knowing that is 150 meters (about 450 feet) from the waste dump to the homes that existed in 1978, estimate how long it took for the waste to move from the dump to the homes given that the sandy soil had a permeability of 10-5 cm/sec (0.00001 cm/sec). (There a 86,400 seconds in a day and 100 cm in a meter)

Answer 1

Answer:

$\large \boxed{\text{About 50 yr}}$

Explanation:

$\text{Time} = \text{150 m} \times \dfrac{\text{100 cm}}{\text{1 m}}\times \dfrac{\text{1 s}}{ 10^{-5}\text{ cm}} \times \dfrac{\text{1 da}}{\text{86 400 s }} \times \dfrac{\text{1 yr}}{\text{365.25 da}}\approx \text{50 yr}\\\\ \text{It took \large \boxed{\textbf{about 50 yr}} for the waste to move from the dump to the homes.}$