Question 73

A person crosses a 500 m long street in 5 minutes. What is his speed in km/h?

Solution

A person crosses a 500 m long street in 5 minutes.

Distance = 500 m

Time = 5 minutes = $$5\times60$$ seconds [1 minute = 60 seconds]

= 300 seconds

Speed = $$\frac{distance}{time}$$

= $$\frac{500}{300}$$

= $$\frac{5}{3}$$ m/s

Now we need to convert m/s to km/h.

We know that 1 km = 1000 m and 1 hour = 3600 seconds.

= $$\frac{5\times\ 3600}{3\times\ 1000}$$ km/h

= 6 km/h

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