Question

A plumber can install the pipes in a bathroom in 4 hours. A different plumber needs 5 hours to do the same job. If both plumbers work together, how many hours will it take to install the pipes?

A. 1
B. 2 2/9
C. 3 1/2
D. 4 1/2

Answer 1

D

Explanation:

If you add 4+5=9 and then divide 9÷2, ( 2 is the number of digits you used) then the answer would be 4 1/2

Answer 2

it would be 3 1/2

Explanation: