Q. A person swims 100 m in the first 40 s, 80 m in the next 40 s and 45 m in the last 20 s. What is the average speed?

Average speed = Total Distance/ Total Time
                               = 100 + 80 + 45 / 40 + 40 + 20
                               = 225 / 100
                               = 2.25 m/s2

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