16 35. "A can do a work in 15 days, which B can do it in 30 days. In how many days will both working together complete the work? (a) 5 (b) 10 (c) 15 (d) 20
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Answer:
10 days
Step-by-step explanation:
Let total work = 30 units
A completes 30 units in 15 days
1 day work of A = 30/15 = 2 units per day
B completes 30 units in 30 days
1 day work of B = 30/30 = 1 unit per day
Combined 1 day work of A and B = 1+2 units per day
Total time = total work / 1 day work
= 30/3 = 10 days
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