SOLUTION: Two college students have started their own business building computers from kits. Working alone, one student can build a computer in 20 hours. When the second student helps, they

Question 315312: Two college students have started their own business building computers from kits. Working alone, one student can build a computer in 20 hours. When the second student helps, they can build a computer in 7.5 hours. How long would it take the second student, working alone, to build the computer.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Two college students have started their own business building computers from kits. Working alone, one student can build a computer in 20 hours. When the second student helps, they can build a computer in 7.5 hours. How long would it take the second student, working alone, to build the computer.
.
Let x = time it takes second student to build it alone
then
7.5(1/20 + 1/x) = 1
Multiplying both sides by 20x:
7.5(x + 20) = 20x
7.5x + 150 = 20x
150 = 12.5x
12 hours = x

RELATED QUESTIONS
Two college students have started their own business building computers from kits.... (answered by ankor@dixie-net.com,ikleyn,greenestamps)

Sixty-two percent of college students have laptop computers, and sixty-eight percent have (answered by ewatrrr)

92% of college students have laptop computers while 68% have ipod-type stereo devices. If (answered by edjones)

Ann and bob have started their own business making hand-made greeting cards. Ann can make (answered by josgarithmetic)

Parallel processing uses two or more computers, working together, to solve a single... (answered by stanbon)

Parallel processing uses two or more computers, working together, to solve a single... (answered by jim_thompson5910)

two students are selected from a group of 4 psychology majors, 3 business majors, and 2... (answered by Boreal)

Lewis and Paula both work at a fast food restaurant. When they both work together... (answered by stanbon)

please help me solve this question. a group of students have three desktop computers and (answered by stanbon)