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If the operating cost of 6 burners for 6 hours in 8 days is Rs. 450 then find the number of burners if used for 5 hours for 10 day with operating cost of Rs.1250.
Two bullets were fired at a place at an interval of 28 min 30 sec. A person approaching the firing point in his car hears the two sounds at an interval of 27 mins. The speed of sound is 330 m/s. What is the speed of car?