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1). 62). 25/43). 124). 25/2

Answer»

A complete work in = 25 days

A’s 1 - DAY work = 1/25

B complete work in = 15 days

B’s 1 - day work = 1/15

Both working together for 1 hour = (1/25) + (1/15)

Both working together for 1 hour = (3 + 5)/75

TIME to complete the work together = 75/8 = 9(3/8) days

∴ Time to complete (2/3) of total work together = (75/8) × (2/3) = (25/4) days



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