A person crosses a 600 m long street in 5 minutes. what is his speed in km per hour?

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Hint: We will convert distance to km using the concept that 1km = 1000m and then convert minutes into hours using the concept that 1 hour = 60 minutes. In the final step we will find the speed of the man using the formula, $\text$ = 7.2 km/h Therefore, we get the speed of the man crossing a 600m long street in 5 minutes as 7.2km/h. Hence, option (B) is the correct answer. Note: Students must make sure that the conversions are done properly as the final answer may change if the values are not converted properly. It must be noted that 1km = 1000m, so to convert m to km, we have to divide by 1000 and to convert km to m we have to multiply by 1000. And we know that 1 hour = 60 minutes, so to convert minutes to hours, we have to divide by 60 and to convert hours to minutes we have to multiply by 60.