Question

A can dig 1/12 of the trench in 1 day, while B can dig 1/6 of trench in 3 days if they work together how long will they take to dig the whole trench? (answer is 36/5)
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Answer 1

Answer:

1/12 +1/6 x 3

lcm of 12 and 6

1 + 2 /12 x 3

3 x 3 / 12

9/12