Aperson x can clean up all of the crime in a city in 10 hr working alone. person y can do the same job alone in 12 hr. if person y starts crime fighting at 9 a. m. and person x joins him at 10 a. m., at what time will they have all the crime cleaned up?

They will clean up all the crime at PM.

Step-by-step explanation:

clean up all crime in .

The work done by is

cleanup all crime in

The work done by in

starts at and starts at .

let after hours from they will finish the work.

worked for and worked for

Multiply both side by

Hence they will finish work ofter

They both will finish work at

687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09

36

step-by-step explanation: