हिमालय की बेटियां पाठ के आधार पर पाँच पवृतो और दस मुख्य नदियों के नाम
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a and b can do a work in 15 days. After 11 days of starting the work a left the work and b finished the work in 24 days. Now, calculate how many time they will take to do the same work separately?
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