Find the Variation

A can do a piece of work in 15 days. He worked for 8 days and the remaining work was finished with the assistance of B in 4 days. How long will B take to do the work alone?
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1 Answer

persun1 du (8/15) av the werk=0.533333333333333333...

persun2 du rest in 4 daes...so his werk rate=(7/12)/4

rate=7/48=0.14583333333333...

time for persun2 alone=1/0.1458.....=6.857142857142857...
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