Question 4
Consider a cuboidal underground tunnel of length 500 m whose cross-section is given in the figure. If $$1 m^3$$ of concrete costs 1000 rupees, find the amount of money needed to build the Tunnel.
Solution
Area of the tunnel to be filled with concrete = 16*8-$$\pi\ \left(32\right)$$
Length of the length along which the tunnel has to be filled with concrete = 500m
Volume = 16*8-$$\pi\ \left(32\right)$$*500
= $$32(4-\pi)$$*500
Cost of concrete per $$1 m^3$$ = 1000
Cost of $$32(4-\pi)$$*500 = $$32(4-\pi)$$*500*1000
=$$16(4-\pi)*10^{6}$$
C is the correct answer.
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