Water is pouring into a cuboidal reservoir at a rate of 60 litre per minute. If area of the base of the reservoir is 36 sq. metre and the depth is 3 metre, then the time taken to fill the tank completely is
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Volume of the reservoir =108 m
3
=108×1000 litres
(∵1m
3
=1000 litres)
The reservoir is filling at the rate of 60 litres per minute.
∴ Required time =
60
108×1000
min.
=
60×60
108×1000
hours=30 hours
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