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Question
The cross section of a tunnel perpendicular to its length is a trapezium ABCD as shown in the figure. AM = BN; AB = 4.4 m, CD = 3 m The height of a tunnel is 2.4 m. The tunnel is 5.4 m long. Calculate the cost of flooring at the rate of Rs.2. 5 per m2.
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Solution
Flooring will be done on an area formed by AB and length.
Area of floor
= AB x length
= 4.4 x 5.4
= 23.76m2
∴ The cost of flooring
= 2.5 x 23.76
= Rs.59.4.
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