The base of a house has area 110 m². One night 12 mm of rain falls on the roof. All of the water goes into a tank which has base diameter 4 m.
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Answer:
Rectangular roof : l=22m,b=20m
Cylindrical tank : r=1m,h=3.5m
The volume of tank =πr
2
h
=
7
22
×1×1×3.5
=
7
22
×
10
35
=11m
3
Area of roof =l×b=22×20=440m
2
Rainfall =
Area of roof
Volume of tank
∴ Rainfall =
440m
2
11m
3
=0.025m
∴ Rainfall is 2.5cm
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