Discussion

Explanation:

1 day’s work of A = 1/10 and that of B = 1/15.

Since they work on alternate days, they would work in cycles of 2 days.

Work done by (A + B) in 1 cycle of two days = 1/10 + 1/15 = 1/6.

Hence, they take 1/(1/6) = 6 cycles to complete the work.

Therefore, they would finish the work in 6 × 2 = 12 days

Hence, option (b).

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