April 18, 2014

Homework Help: math

Posted by Guadalupe on Monday, May 14, 2007 at 5:19pm.

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.


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


Answer this Question

First Name:
School Subject:

Related Questions

physics - In diving to a depth of 558 m, an elephant seal also moves 925 m due ...
English - 1. There is a seal mark on the piece of paper,for I pressed the seal ...
Math - Barry can do a certain job in 3 hours, whereas it takes Sanchez 5 hours ...
College Algebra - It takes Todd 3 hours longer than Tom to paint a 4x5 feet ...
Algebra, URGENT!!! - 1) Mio can build a large shed in 15 days less than Yuuko ...
Algebra II - Jack usually mows his lawn in 6 hours. Marilyn can mow the same ...
Physics - In diving to a depth of 979 m, an elephant seal also moves 104 m due ...
physics - In diving a depth of 735m, an elephant seal also moves 600m due east ...
math - Alex takes 3 hours longer to complete a certain job than Barry does. If ...
math - 10. A house painter can finish a house in 6 hours. His partner can finish...