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Question
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?
Solution
Given: s1 = 100 m, t1 = 40 s, s2 = 80 m, t2 = 40 s, s3 = 45 m, t3 = 20 s
Average speed = ?
Average speed = `"Total distance"/"Total time"`
Average speed = `(s_1 + s_2 + s_3)/(t_1 + t_2 + t_3)`
= `(100+80+45)/(40+40+20)`
= `225/100`
= 2.25 m/s
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