Question
A runner completes 400 metres in 50 seconds. Another runner completes the same distance in 45 seconds. Who has a greater speed and by how much?
✓
Answer
Runner 1:
Distance $=400 m$,
Time $=50 s$
$\text { SPeed }=\frac{\text { Distance covered }}{\text { Time taken }}=\frac{400 m}{50 s}=8 m / s$
Runner 2:
Distance $=400 m$,
Time $=50 s$
$\text { SPeed }=\frac{\text { Distance covered }}{\text { Time taken }}=\frac{400 m}{45 s}=8.89 m / s$
Difference $=8.89-8=0.89 m / s$
Hence, speed of runner 2 is greater by approximately $0.89 m / s$.
Distance $=400 m$,
Time $=50 s$
$\text { SPeed }=\frac{\text { Distance covered }}{\text { Time taken }}=\frac{400 m}{50 s}=8 m / s$
Runner 2:
Distance $=400 m$,
Time $=50 s$
$\text { SPeed }=\frac{\text { Distance covered }}{\text { Time taken }}=\frac{400 m}{45 s}=8.89 m / s$
Difference $=8.89-8=0.89 m / s$
Hence, speed of runner 2 is greater by approximately $0.89 m / s$.
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