While working together on a task, Amit and Sumit received Rs. 600 and Rs. 400 respectively. If Amit can do the task alone in 12 days, then how much time will Sumit take to do the task alone?

While working together on a task, Amit and Sumit received Rs. 600 and Rs. 400 respectively. If Amit can do the task alone in 12 days, then how much time will Sumit take to do the task alone?
1). 8 days
2). 9 days
3). 15 days
4). 18 days

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