Two men can do a piece of work in 6 hours and 4 hours respectivly. After the first has worked for 2 hours, he is joined by the other. By when should the work be completed.
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Answered by
2
Answer:
the remaining work should be completed in 1hr 36 min
Step-by-step explanation:
Let the man A say works for 6hrs. Then in 1hr the man A can do 1/6th part of work.
Similarly the other man B say works for 4 hrs. Then the man B can do 1/4th part of work in 1 hr.
So together A & B can do(1/6+1/4=5/12th part of work in 1 hr.
Now A starts the work and in 2hrs completes 2×1/6=1/3rd part of work .
The remaining work left is (1-1/3=2/3rd part).
Now B joins, So both A & B complete 5/12th part of work in 1hr .
total work complete in 1÷5/12=12/5hrs .
the remaining 2/3rd part complete in 12/5×2/3=24/15=1hr & 9×60/15=1hr36 mins.
Answered by
1
Answer:
1hr36
Step-by-step explanation:
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