Question

i give medals if you help One person can do a certain job in ten minutes, and another person can do the same job in fifteen minutes. How many minutes will they take to do the job together?

4 min
5 min
6 min

Answer 1

x / +

Answer 2

A can do the job in 10 minutes
or, In 1 minute, A can do 1/10 of the job.
B can do the job in 15 minutes
or, In 1 minute, B can do 1/15 of the job.

Together, in 1 minute they can do 1/10+1/15 = 1/6 of the job.

So, it would take 6/1 = 6 minutes to finish the job if they both work together.

Answer 3

Where A is the one person and B is the "Another Person".

Answer 4

(10 * 15) / (10+15) = 6

Answer 5

thanks

Answer 6

yw