5 A city municipality arranges for the removal of its garbage by means of motor vehicle transport. The following vehicles are maintained : No. of vehicles Specification 20 5 ton lorries 30 4 ton lorries 50 3 ton lorries 40 2 ton lorries On an average each lorry makes six trips a day and in each trip covers an average distance of five kms. Each lorry carries garbage of 60% its capacity. On an annual average, 20% of the lorries are laid up for repairs. The conservancy work is carried out daily. Calculate tonne-kms. utilised for removal of garbage per month