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प्रश्न
A can do a piece of work in 20 days and B can do the same work in 15 days. How long will they take to finish the work, if both work together?
पर्याय
`13 1/2`days
10 days
`8 4/7` days
`17 1/2` days
MCQ
उत्तर
`8 4/7` days
Explanation:
A can-do in = 20 day
B can do in = 15 day
Both can do in`=((20)(15))/(20+15)(("xy")/("x+y") )`
`=300/35=60/7=8 4/7` days
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Time and Work (Entrance Exam)
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