Question

Smith and Thomas can do a piece of work in 72 days; Thomas and Clark can do it in 120 days; Smith and Clark can do it in 90 days. In what time can Smith, Thomas and Clark do it, working together? ​

Answer 1

Step-by-step explanation:

A and B can do a piece of work in 72 days B and C can do it in 120 days A and C can do it in 90 days when a B and C work together the amount of work that will be finished in 3 days is

B and C can do it in 120 days, A and C can do it in 90 days. In how many days all the three together can do the work ? ∴ A, B and C together can finish the whole work in 60 days. Hence option [B] is the right answer.