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Abu boarded a bus at 7 in the morning. U...

Abu boarded a bus at 7 in the morning. Usually the bus travels `30 (km) `/` h` on average, to reach the railway station at 11. But since it was raining, the bus could run only `20 (km)`/` h` on average. Abu got down from the bus at 9 , caught a car and reached the station at 11 itself. What was the average speed of the car?

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