Given:
Vikas complete the work = 15 days
Bablu can complete the same work = 10 days
Solution:
Total work = LCM of (15, 10) = 30 units
Efficiency of Vikas = 30/15 = 2 unit/day
Efficiency of Bablu = 30/10 = 3 unit/day
Both efficiency = 2 + 3 = 5 unit/day
Together they complete the work = 30/5 = 6 days.
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