A B CAN TOGETHER BUILD A WALL IN 25 DAYS .THEY WORKED TOGETHER FOR 15 DAYS THEN B GOES AWAY. A FINISHES THE REST OF THE WORK ALONE IN 20 DAYS.HOW LONG WILL EACH TAKE TO FINISH THE WORK SEPARATELY ?
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A can work in 12 days
B can do in 13 days
B can do in 13 days
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