Question

A can dig 1/12 of a trench in 1 day, while B can dig 1/6 of the trench in 3 days. If they work
together, how long will they take to dig the whole trench?​

Answer 1

Step-by-step explanation:

A's one day work = 1/12

B's three day work = 1/6

therefore, B's one day work = 1/6÷3

= 1/6×1/3

= 1/18

(A+B)'s one day work = 1/12+ 1/18

= 5/36

therefore, time taken by both A and B to complete the whole work = 36/5 days

= 7 1/5 days

Answer 2

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