railway RRB Technician Grade 1 Mock Test 2024 Quantitative Aptitude Time and Work Work Efficiency

10 people can build a wall in 12 days. Six people, each only half as efficient as those in the first group, will be able to complete 3/5 of such a wall in:

1
24 days
2
25 days
3
20 days
4
18 days
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