Question
A person is to reach a destination 40 km away. If he
covers the first 25 km in 4 hours then at what constant speed should he go so that the average speed for the whole journey becomes 8 km/hour?Solution
ATQ, 
Therefore, the person should maintain a constant speed of 15 km/hour for the remaining distance to achieve an average speed of 8 km/hour for the whole journey.
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