Jimmy runs #1# #1/4# kilometers in 5 minutes. Rachel runs #2# #1/2# kilometers in 10 minutes. Whose speed is greater?

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Answer 1 · 2018-04-04T13:53:46

None

Jimmy's speed is:

#(1 1/4 \ "km")/(5 \ "min")=1/4 \ "km/min"#

Rachel's speed is:

#(2 1/2 \ "km")/(10 \ "km")=1/4 \ "km/min"#

From here, you can see that Jimmy's speed is the same as Rachel's speed, so nobody runs faster than the other person.

Answer 2 · 2018-04-04T14:35:37

Both are running at the same speed.#250#m/minute

#1km=1000m#

Jimmy runs:-
#:.5 #minutes#=1 1/4 km=1.25xx1000=1250m#

#:.1# minute#=1/cancel 5^1 xx cancel 1250^250/1m#

#:.1# minute#=250# m

Rachel runs:-

#:.10 #minutes#=2 1/2 km=2.5xx1000=2500m#

#:.1# minute#=1/cancel 10^1 xx cancel 2500^250/1m#

#:.1# minute#=250# m

Both are running at the same speed.#250#m/minute