1.

A and B complete a work in 6 days. If A alone can do the same work in 10 days then B alone will do it in how many days?1. 8 days2. 12 days3. 16 days4. 15 days

Answer» Correct Answer - Option 4 : 15 days

Given:

Time taken by A and B = 6 days

Time taken by A = 10 days

Formula used:

Total work = Time taken × Efficiency

Calculation:

L.C.M of (6 and 10) = 30 = Total work

Efficiency of A and B = 30/6 = 5 units/day

Efficiency of B = 30/10 = 3 units/day

Efficiency of B = (5 – 3) units/day

⇒ 2 units/day

Time taken by B = 30/2 days

⇒ 15 days

∴ B will complete the work in 15 days.



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