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QUESTION
John runs a 20 k race against Sam. John averages 4.5ms for the first half of the race, then runs at a speed of 4.2 m/s until the last 300 m. During...
John runs a 20 k race against Sam. John averages 4.5ms for the first half of the race, then runs at a speed of 4.2 m/s until the last 300 m. During that 300 m, he covers at a speed of 4.6 m/s. How fast would Sam have to run to be John?
