If A, B and C can complete a piece of work in 3, 5 and 6 days respectively, then together they will complete the work in

A1 and three-sevenths days ✓ Correct

B2 and four-sevenths days

C1 and one-half days

D2 and one-third days

Correct answer: (A) 1 and three-sevenths days

Explanation

Together they finish in 1 and 3/7 days.

Combined one-day work = 1/3 + 1/5 + 1/6.

Taking LCM 30: (10 + 6 + 5)/30 = 21/30 = 7/10.

Time = reciprocal = 10/7.

So 10/7 = 1 and 3/7 days.

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