A car travels a distance of 100 km. It travels first 15 km at a speed of 20 km/h, next 70 km at a speed of 30 km/h and remaining distance at a speed of 25 km/h. Calculate the average speed of the car.
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A mixture of iron nails, salt, oil and water is provided to you. Give stepwise methods to separate each component from this mixture.
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