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- Take total work as 1 or LCM.
- Find each one-day work rate.
- Combine rates as required.
Correct Answer: B
Correct Answer: B
Method / Topic: Time and Work
The answer is based on combined work rates.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Time and Work
<table cellspacing="0" style="border-collapse:collapse; width:85px">
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<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:bottom; white-space:normal; width:85px">A’s one-day work = 1/12 and B’s one-day work = 1/18. Together, one-day work = 1/12 + 1/18 = 3/36 + 2/36 = 5/36. So time taken = 36/5 = 7.2 days.</td>
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</table>
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Take total work as 1 or LCM.
- Find each one-day work rate.
- Combine rates as required.
A can complete a work in 12 days and B can complete it in 18 days. In how many days will they complete it together?
Explanation
Correct Answer: B
Method / Topic: Time and Work
The answer is based on combined work rates.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Time and Work
<table cellspacing="0" style="border-collapse:collapse; width:85px">
<tbody>
<tr>
<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:bottom; white-space:normal; width:85px">A’s one-day work = 1/12 and B’s one-day work = 1/18. Together, one-day work = 1/12 + 1/18 = 3/36 + 2/36 = 5/36. So time taken = 36/5 = 7.2 days.</td>
</tr>
</tbody>
</table>
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