Fuel economy

How many kilometers is sufficient petrol in the cylinder fuel tank with a diameter 40 cm and the base of tank length 1 m, when it is filled to 60% and if the car consume 15 liters per 100 km?

Correct result:

x =  502.7 km

Solution:

$$\begin{gathered} D=40\mathrm{/}10=4 \\ l=1\cdot 10=10 \\ r=D\mathrm{/}2=4\mathrm{/}2=2 \\ V=\pi \cdot r^2\cdot l=3.1416\cdot 2^2\cdot 10\doteq 125.6637 \\ {V}_2=60\mathrm{/}100\cdot V=60\mathrm{/}100\cdot 125.6637\doteq 75.3982 \\ x=V_2\cdot 100\mathrm{/}15=75.3982\cdot 100\mathrm{/}15=502.7\text{ km} \end{gathered}$$

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