जॉइन Examsbookउत्तर : 4. "12 6/7 days"
A can do a piece of work in 30 days. He works at it for 6 days and then B finishes it in 18 days. In what time can A and B together it ?5
प्र: A can do a piece of work in 30 days. He works at it for 6 days and then B finishes it in 18 days. In what time can A and B together it ?
- 114 1/2 daysfalse
- 211 daysfalse
- 313 1/4 daysfalse
- 412 6/7 daystrue
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उत्तर : 4. "12 6/7 days"
व्याख्या :
Answer: D) 12 6/7 days Explanation: Let 'B' alone can do the work in 'x' days 6/30 + 18/x = 1 => x = 22.5 1/30 + 1/22.5 = 7/90 => 90/7 = 12 6/7 days