SOLUTION: peter can finish an accounting work in 8 hours. david can finish the same work in 6 hours. After 2 hours of working together, peter left david for lunch and david finished the job.

Question 985198: peter can finish an accounting work in 8 hours. david can finish the same work in 6 hours. After 2 hours of working together, peter left david for lunch and david finished the job. how long does it take david to finish the job?
Answer by srinivas.g(540) (Show Source): You can put this solution on YOUR website!
Peter can finish an accounting work in 8 hours..
let total work be 1 unit
In 1 Hour, amount of work done by peter = 1/8
david can finish the same work in 6 hours
In 1 Hour, amount of work done by David = 1/6
In 1 Hour, amount of work done by both peter and david together =
=
=
=
In 2 hours, amount of work done by both together =
=
after 2 hours , peter left
amount of work remaining =
=
this remaining work completed by David alone
David finish total work alone in 8 hours
david finish of the work in =
=
=3.33 Hours
= 3 hours +0.33 hour
= 3 hours+0.33*60 min
= 3 hours 20 minutes
David finish the remaining work in 3 hours 20 min

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