SOLUTION: Guru is 5 times as efficient as hari . Guru and hari can work together and completes a task in 15 days. How long guru take to complete the work by himself. A.16 B. 20 C.18 D. 32

Question 862915: Guru is 5 times as efficient as hari . Guru and hari can work together and completes a task in 15 days. How long guru take to complete the work by himself.
A.16 B. 20 C.18 D. 32
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Guru is 5 times as efficient as hari . Guru and hari can work together and completes a task in 15 days. How long guru take to complete the work by himself.
***
let x=How long Guru would take to complete the work by himself.
1/x=His work rate
5x=How long Hari would take to complete the work by himself.
1/5x=His work rate
15=days it would take to complete the the job working together
1/15=their work rate
sum of individual work rates=work rate working together
...

LCD:5x
5+1=x/3
x=18
How long Guru would take to complete the work by himself.18 days (ans. C)
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