A bus run at 100 km/hr top speed. It can carry a maximum of 6 persons. If speed of bus decreases in fixed proportion with increase in number of person, find speed when three person are traveling in bus.

This is a trick question. The bus's top speed is 100 km/hr, and speed only drops as the number of passengers increases toward the maximum of 6. With just 3 persons aboard, the bus is well under capacity and can still travel at its full top speed, so the answer is 100 km/hr.

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