2 person A and B can finish job in 12 days. if B twice as efficient as A, in how many days will A alone finish job
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A and B can do a job together in 12 days. A is 2 times as efficient as B. In how many days can B alone complete the work ?
A) 36
B) 12
C) 18
D) 9
Correct Answer:
A) 36
Description for Correct answer:
Time taken by A to complete a work
= x days
Time taken by B to complete the same work
= 2x days
According to the question,
1x+12x=1121x+12x=112
=> 32x=11232x=112
x=3×1223×122=18
Time taken by B to complete the same work = 2x=2×182×18=36days
A) 36
B) 12
C) 18
D) 9
Correct Answer:
A) 36
Description for Correct answer:
Time taken by A to complete a work
= x days
Time taken by B to complete the same work
= 2x days
According to the question,
1x+12x=1121x+12x=112
=> 32x=11232x=112
x=3×1223×122=18
Time taken by B to complete the same work = 2x=2×182×18=36days
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