If Denise can run 5 km in 30 minutes and Clark can run 6 km in 39 minutes, who's faster?

2 Answers
Jun 11, 2018

Denise is faster

Explanation:

The speed is defined as the ratio between the distance you travel, and the time it takes to travel such a distance. So, Denise travels #5# km in #30# minutes, meaning her speed is #5/30 = 1/6 approx 0.16# km per minute.

On the other hand, Clark can travel #6# km in #39# minutes, meaning his speed is #6/39 = 2/13 approx 0.15# kilometers per minute.

So, Denise is slightly faster than Clark

Jun 11, 2018

Densie

Explanation:

Speed of Densie is

#"v"_1 = "Distance"/"Time" = "5 km"/"30 min" = "0.167 km/min"#

Speed of Clark is

#"v"_2 = "Distance"/"Time" = "6 km"/"39 min" = "0.154 km/min"#

#"v"_1 > "v"_2#. Therefore Densie is faster.