If A can complete a piece of work in 6 hours and B can complete the same work in 4 hours, and both work together for 2 hours, how much more time will A alone require to finish the remaining work?
- 1 hour
- 30 minutes
- 45 minutes
- None of these
Explanation
A's rate = 1/6, B's rate = 1/4; together = 5/12 of the work per hour.
In 2 hours, they complete 10/12 = 5/6 of the work, leaving 1/6.
A alone completes 1/6 of the work in 1 hour.
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