Book: NCERT - Mathematics
Chapter: 11. Mensuration
Subject: Maths - Class 8th
Q. No. 8 of Exercises 11.4
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8
Water is pouring into a cuboidal reservoir at the rate of 60 litres per minute. If the volume of reservoir is 108 m3, find the number of hours it will take to fill the reservoir.
The volume o the reservoir is 108 m3 = 108000 L
(∵ 1 m3 = 1000 Litre)
And, water if poured into the reservoir at the rate = 60 L per minute.
⇒ In 1 min, the water poured in tank = 60 L
⇒ In 60 min (1 hour), the water poured in tank = 60 × 60 = 3600 L
∴Time to fill the reservoir,
= 30 hours
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