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A 60 kg man runs up a staircase in 12 seconds while a 50 kg man runs up the same staircase in 11, seconds, the ratio of the rate of doing their work is

1. 6 : 5
2. 12 : 11
3. 11 : 10
4. 10 : 11 h PG #3

Correct answer: 11 : 10

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