Question

How long will an athlete take to run a race of 500 m, if his speed is 50 km per hours?

Answer 1

$\mathbf{We \: know, speed = \frac{Distance}{Time} \: }$

Hence,

$50 \ \frac{km}{hr} = \frac{500m}{time} \\ \\ \\ = > 50000 \times \frac{m}{1} = \frac{500}{time} \times m \\ \\ \\ = > time \: = \frac{500 \times 1}{50000} \\ \\ \\ => time \: = \frac{1}{100} hr$

Hence he will take 0.01 hours

Or ( 1 / 100 × 60 ) = 3 / 5 minutes