A, B and C can independently complete a task in 6, 8 and 12 hours respectively. C starts working. 2 hours later she stops and simultaneously A and B starts working. Yet another 2 hours later, B stops working too. Now how long does A have to work alone to complete the task?
A.
2 hours
B.
1.5 hours
C.
3 hours
D.
4 hours
Correct Answer : B

Question

A, B and C can independently complete a task in 6, 8 and 12 hours respectively. C starts working. 2 hours later she stops and simultaneously A and B starts working. Yet another 2 hours later, B stops working too. Now how long does A have to work alone to complete the task?

A.
2 hours
B.
1.5 hours
C.
3 hours
D.
4 hours

Correct Answer : B

A to Z Exams · Accepted Answer

1.5 hours

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