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Test # 115


1.
Two pipes A and B can fill a tank in 4 & 5 hrs respectively. If they are turned on alternately for 1 hr each, the time taken to fill the tank is

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Idiom of the Day

lay in (something) or lay (something) in
to store up a supply of something, to get and store something for future use
The farmer is trying to lay in as much food as possible before winter comes.
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