Question

help me please as its necessary

Answer 1

$average \: speed = \frac{total \: distance}{total \: time \: taken}$

$distance = speed \times time$

${d}^{1} = 2.5 \times 100 = 250m \\ {d}^{2} = 1.5 \times 100 = 150m$

$total \: distance = 250 + 150 = 400m \\ \\ total \: time \: taken = 100 + 100 = 200sec$

$average \: speed \: = \frac{400}{200} = 2 m {s}^{ - 1}$

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Answer 2

He is a fast swimmer w