math
posted by Guadalupe .
How do you do this one?
Almir can seal a driveway in 4 hours. Working together, he and Louis can seal it in 2.3 hours. How long would it take Louis to seal it working alone?
Thanks in advance.
D:3+4D=19
Driveway (D) = Rate * Time
let Louis' time alone be t hours
so Louis' rate is D/t
Almir's rate is D/4
their combined rate is D/2.3
so D/4 + D/t = D/2.3
divide by D,
1/4 + 1/t = 1/2.3
2.3t + 9.2 = 4t
I got t=5.411 hours
So Louis' rate alone is 5.4 Hours
thanks!
Respond to this Question
Similar Questions

Math
Al can paint a room in a hours working alone. Bill can paint a room in b hours working alone. Working alone, Bill takes tow more hours to paint a room than Al. Working together, they can paint a room in 8 hours. Write down a system … 
English
1. There is a seal mark on the piece of paper,for I pressed the seal on the piece of paper. 2. There is a seal on the piece of paper,for I pressed the seal on the piece of paper. (Which one is correct? 
math
1.a collection of 105 coins consists of 1 peso and 5 pesos. if the total value is 205 pesos, find the number of coins of each denomination in the collection. 2.leslie's wallet contains 20 peso bills and 1 peso coins with a total of … 
College Algebra
It takes Todd 3 hours longer than Tom to paint a 4x5 feet bedroom. Working together, both can complete the job in two hours.How long does it take each one to complete the painting job working alone? 
Algebra, URGENT!!!
1) Mio can build a large shed in 15 days less than Yuuko can. If they build it together, it would take them 18 days. How long would it take each of them working alone? 
Algebra
Dorothy and Rosanne are baking cookies for a party. Working alone, Rosanne can finish the cookies in 6 hours. Dorothy can finish them in 8 hours if she is working alone. How long will it take them to bake the cookies if they are working … 
Math
Dorothy and Rosanne are baking cookies for a party. Working alone, Rosanne can finish the cookies in 6 hours. Dorothy can finish them in 8 hours if she is working alone. How long will it take them to bake the cookies if they are working … 
Math
Gina and Maggie working together can do their MI4 project in 24 hours. If Gina works alone for 8 hours and Maggie then finishes the job in 30 hours, how many hours would it take each working alone to do the project? 
Math
Alex can complete a model rocket assembly in four hours less time than it takes Sean. Working together, they can complete the assembly in one and a half hours. How long would it take Alex to do the assembly working alone? 
General Math
An island has 12 fur seal rookeries (breeding places). To estimate the fur seal pup population in Rookery A, 6982 fur seal pups were tagged in early August. In late August, a sample of 700 pups was observed, and 245 these were found …