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WAEC Mathematics 2015 Paper
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© africaexams.com
Question : 36
Total: 45
The rate of consumption of petrol by a vehicle varies directly as the square of the distance covered. If 4 litres of petrol is consumed on a distance of 15km. how far would the vehicle go on 9 litres of petrol?
22
1
2
km
30km
33
1
2
km
45km
Validate
Solution:
R
α
D
2
R = D
2
K
R = 4 Litres when D = 15cm
thus; 4 = 15
2
k
4 = 225k
k =
4
225
This gives R =
4
D
2
225
Where R = 9litres
equation gives
9 =
4
D
2
225
9 x 225 = 4d
2
D
2
=
9
×
225
4
D =
√
9
×
225
4
=
3
×
15
2
= 22
1
2
km
© africaexams.com
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