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Nishit Transport Corporation (NTC) operates buses between Kolkata and Patna. To increase the profit, NTC has sought the services of Dipanjan Das and Sons consultants. After a thorough study of the mechanism of the whole business, Dipanjan Das and Sons suggested that—(i) profit in running a bus is directly proportional to the distance when the number of passengers is constant, and (ii) directly proportional to the number of passengers in excess of a certain fixed number when the distance is constant. The profit is Rs 80 when 30 passengers are carried over a distance of 40 km, and Rs 180 when 35 passengers are carried over 60 km. What should be the advice, furnished by Dipanjan Das and Sons consultants, regarding the minimum number of passengers to be carried, so that there is no loss?