Question
Uncle Luis travelled from City D to City E which was 650 km away. For the first 400 km of the journey, he travelled at a speed of 80 km/h. He then reduced his speed by 30 km/h and completed the rest of the journey. What was his average speed for the whole journey?
4 m

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Uncle Luis travelled from City D to City E which was 650 km away. For the first 400 km of the journey, he travelled at a speed of 80 km/h. He then reduced his speed by 30 km/h and completed the rest of the journey. What was his average speed for the whole journey?