A water tank has 4 inlet pipes of the same size. If only 3 pipes are opened at a time it takes 6 hours to fill the water tank, find the time taken to fill the tank if all the 4 pipes are opened simultaneously. Also, find the time taken to fill the water tank if only 2 pipes are opened at a time.
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Answer:2 pipe= 4hour
4 pipe = 8 hour
Step-by-step explanation: if three pipes are taken and it takes 6 hours
then 1 pipe take 3 divided by 6 = 2hours
all pipe opened = 4x2 = 8hours
2 pipe= 2x2 = 4 hour
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