Fill the Water Tank

• Water tank has three inlet pipes and one outlet pipe. One inlet pipe A takes 2 hours to fill the tank. Another inlet pipe B takes 3 hours to fill the tank. The third inlet pipe C takes 4 hours to fill the tank. The outlet pipe D empties the whole tank in 12 hours. If the tank is initially empty, how long would it take to fill the tank if all the inlets and outlet pipes are fully in operation?
  
  
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• Right Answer of the last asked Question is here........
  
  
  James bought 4 different items worth $ 6.75 from a store. when he check out, his friend alerted him that the store clerk, instead of adding the prices, multiplied the prices of the 4 items he bought. James did not seem to care much about it. Instead, he said, "The price is the same whether you multiplied them or added them." If one of the items he bought was worth $ 1.50, what are the prices of the three other items James bought?
  
  
  

  Total Four item prices are $ 1.00, $ 1.50, $ 2.00 and $ 2.25.