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A can do a half of certain work in 70 days and B one third of the same in 35 days. They together will do the whole work in.
- A420 days
- B120 days
- C105 days
- D60 days
Correct answer: D
Discussion 1
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CCommunity
60 days
A = 140 days
B = 105 days
1/140 + 1/105 = 7/420 = 1/60
=>60 days
A = 140 days
B = 105 days
1/140 + 1/105 = 7/420 = 1/60
=>60 days