The rate of consumption of petrol by a vehicle varies dir...
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?
2212km
30km
3312km
45km
Correct answer is A
R α D2
R = D2K
R = 4 Litres when D = 15cm
thus; 4 = 152k
4 = 225k
k = 4225
This gives R = 4D2225
Where R = 9litres
equation gives
9 = 4D2225
9 x 225 = 4d2
D2 = 9×2254
D = √9×2254
= 3×152
= 2212km
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