Question

Mark and liam washed the car for 2 hours while Zion do the same job for 3 hours, how long will it takes if the work together

Answer 1

Answer:

Mark and Liam

In 2 hour can complete the work=1

In 1 hour can complete the work=1/2

Zion

In 3 hour can complete the work=1

In 1 hour can complete the work=1/3

Mark,Liam and Zion can complete the work=1/2+1/3

=3+2/6

=5/6

5\6 part completed in 1 day

1 part =1*6/5=1 whole 1/5