SOLUTION: one person with a skiploader requires 12 h to remove a large quantity of earth. a second, larger skiploader can remove the same amount of earth in 4 h. how long would it take to re

Question 446847: one person with a skiploader requires 12 h to remove a large quantity of earth. a second, larger skiploader can remove the same amount of earth in 4 h. how long would it take to remove the earth with both skiploaders working together?
Answer by htmentor(1343) (Show Source): You can put this solution on YOUR website!
The first person's removal rate is 1 per 12 hours (e.g. 1 ton per 12 hrs)
The second person's removal rate is 1 per 4 hours
Working together their rate in equation form is:
1/12 + 1/4 = 1/12 + 3/12 = 4/12 = 1/3
This says that the removal rate working together is 1 (ton) per 3 hrs
Taking the reciprocal we get 3 hrs per 1 ton
Ans: 3 hours
RELATED QUESTIONS
A construction company needs to remove 30 tons of dirt from a construction site. They can (answered by Alan3354)

I need to pump water out of a swimming pool. My first pump will remove all the water in... (answered by josmiceli)

A family in Japan has a square home with 4 square rooms measuring 121 ft squared each.... (answered by Mathtut)

The cost, in millions of dollars, to remove x % of an oil spill in the Gulf of Mexico... (answered by JBarnum)

Kayeley attempts to remove a nut on a bicycle using a wrench. Removing the nut requires a (answered by Alan3354)

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C = (answered by checkley77)

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by... (answered by solver91311)

Suppose there are N marbles in a bowl. Al, Bo, and Coy will take turns (Al will go 1st)... (answered by venugopalramana)

A doctor is performing surgery to remove a patient�s tumor. The tumor is enclosed in a... (answered by solver91311)