"A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its
Channel: Doubtnut
Date: 2020-04-05

"A cistern of
 capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its
 walls are 5 cm thick. The thickness of the bottom is
(a) 90 cm (b) 1 dm (c) 1 m (d) 1.1 m"