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WAEC Mathematics 2017 Paper
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© africaexams.com
Question : 14
Total: 49
Water flows out of a pipe at a rate of 40
π
c
m
2
per seconds into an empty cylinder container of base radius 4cm. Find the height of water in the container after 4 seconds.
10 cm
14 cm
16 cm
20 cm
Validate
Solution:
Volume of a cylinder =
π
r
2
h
40
π
c
m
3
=
π
.
4
2
h
40
c
m
3
= 16h
h = 2.5cm/sec
In 4 seconds, 2.5cm x 4
= 10cm
© africaexams.com
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