15. A can paint a fence in 1 hours if he worked alone. With B's help. A and B paint the fence together in
I hour How long would B take to paint the fence alone?
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Surinder can paint a fence in 1 hour 30 minutes, but he asks Sunder to help and together they paint the fence in 1 hour. How long would Sunder take if he was to paint the fence alone?
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