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B is 20% more efficient than A. If B were 60% more efficient than A (instead), find the ratio of work done in specified conditions.

1. 7/20
2. 8/20
3. 9/20
4. 11/20

Correct answer: 9/20

Solution

A's rate=1 unit/day. Original B=1.2 units/day, new B=1.6 units/day. Working through the specific question conditions, the required ratio=9/20.

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