Salim and Ali can finish a work in 10 days. Salim can do the same work in 30 days. In how many days did Ali alone do the same work?
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Salim requires 30 days to complete 100% (99.9%) of the work. With Salim’s speed of working staying constant, he can complete 33.3% of the job in 10 days.
Ali seems to have the capability to work faster than Salim.
Therefore, Ali will have to complete 66.6% and Salim will have to complete 33.3% of the job to ensure that it is finished in 10 days.
If Ali can complete 33.3% of the job alone every 5 days, he can complete 99.9% (100%) of the job alone in 15 days.
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