The cross section of a tunnel, perpendicular to its length is a trapezium, ABCD in which AB = 8 m, DC = 6 m and AL = BM. The height of the tunnel is 2.4 m and its
length is 40 m. Find:
(i) the cost of paving the floor of the tunnel at Rs. 16 per .
(ii) the cost of painting the internal surface of the tunnel,excluding the floor at the rate of Rs. 5 per . [Hint: (i) Area of the floor = (40 *8) m2
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