1.

1). 12 days2). 6 days3). 3 days4). 24 days

Answer»

Time taken by PANNALAL to do the job = 20/(1/3) = 60 DAYS

Time taken by Sai Prasad to do the job = 10/(2/3) = 15 days

∴ Time taken by both Pannalal and Sai Prasad together to do the job = 1/(1/15 + 1/60) = 12 days



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