Question

PLEASE HELP
a shipping clerk can finish an order in 13 hours, another in 15 hours. If they work together they can finish in how many hours?

Answer 1

The first clerk does 1/13 of the job in 1 hour. In x hours he does x/13 of the job. the second clerk does 1/15 of the job in 1 hour. In x hours he does x/15 of the job. Working together they do 1 entire job. So:

x/13+x/15 = 1

Answer 2

Solve that and you will get 195/28 hours = 6 27/28 hours

Answer 3

13 hours - entire work.
Work done in ne hour by him = 1/13
And work done in one hour don by other guy = 1/15
Total workdne in oe hour by both of them together = 1/13 + 1/15 = 28/195
Therefore time taken to complete entire work = 195/28 hours.

Answer 4

thank you guys!

Answer 5

yw