How many numbers of five digits may be formed with the digits 5, 0, 9, 0, and 6?

³P1 ways and remaining 4 digits 4!/2! (as 0 occurs twice) ways ³P1 × 4!/2! = (3×4×3×2!)/2! = 36 ways

The average speed of a bus is 2/3 of the average speed of a car which covers 1800 km in 20 hrs. What is the average speed of the bus?

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