Air pollutants that produce photochemical smog include
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Answer:
Ozone, chlorine and sulphur dioxide.
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Explanation:
Two pipes A and B can fill a petrol tanker in 15 and 12 hours respectively. A
third pipe C can empty the whole tanker in 6 hours. If the tanker is full and all
three pipes are opened together, how long would they take to empty it?
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