GATE 2022 AR — Planning – Question 28

Infrastructure, Services and Utilities · Solid waste management: collection, storage, transportation and disposal · 1 mark · Numerical answer

A town of 0.45 million people produces 0.21 kg waste/person/day, 40% organic. All organic waste must be transported daily by one 15-ton-capacity truck. Find the minimum number of round trips in a week, as an integer.

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Correct answer: 21 to 21

Explanation

Organic waste each day is 450000×0.21×0.40=37800 kg=37.8 tonnes. Daily clearance needs ceil(37.8/15)=3 trips. Seven daily collections therefore need 3×7=21 trips. Rounding only the combined weekly tonnage down to a pooled schedule would violate the daily-clearance requirement.

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