Anjali and Dhruv can do a job in 10 and 20 hours respectively. Anjali builds a toy tower while Dhruv destroys it. Then in how many hours they will finish the job if they work on alternate hours starting with Anjali like Anjali, Dhruv, Anjali,....?
Answers
Explanation:
Anjali can complete job in 10 hours. Means in hour jobs he will complete 1/10 of job.
Similarly Dhruv can complete same job in 20 hours. Means in hour jobs he will complete 1/20 of job.
If they work together, with each hour of alternative works, then total time will be;
Anjali, Dhruv, Anjali, Dhruv…….
= 1/10 + 1/20 + 1/10 + 1/20 + 1/10 + 1/20 + 1/10 + 1/20 + 1/10 + 1/20 + 1/10 + 1/20 + 1/10
= 1
Events are 13 hence if they work on alternate hours, total time will be 13 hours
Answer:
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Explanation:
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