'A' can do a piece of work in 2 hours, 'B' can do thrice the work in 8 hours and 'C' can do the same work as 'A' in 8 hours. If all of them work together, how long it would take them to complete the work?

1 hour
2 hour
3 hour
4 hours

Correct Answer: 1 hour

Explanation:

Efficiency of A = 50% [100/2]
Efficiency of B = 37.5% [100/(8/3)]
Efficiency of C = 12.5% [100/8]
Combined efficiency of A,B and C = 100%
So, they complete the work in 1 hour.

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