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1st pipe DATA:

Time = 15/2 hr/job ;Rate = 2/15 job/hr

--------------------

2nd pipe DATA:

Time = 10 hr/job ; Rate = 1/10 job/hr

----------------------

2nd for 8 hrs + 1st for x hrs = 1 job

8(1/10) + (2/15)x = 1

Multiply thru by 30 to get:

24 + 4x = 30

4x = 6

x= 3/2 hrs (time the 2nd pipe will take to finish the job)

x= 1 1/2 hours

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15y ago

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