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Jenny is running a 10-km race that starts at 9:00 a.m. Linus is running a 6-km race that starts 20 minutes later at 9:20 a.m. If Linus takes 30 minutes to finish his race, what must Jenny’s average running speed be, in kilometers per hour, to finish her race at the same time Linus finishes his race?

 Jul 23, 2022
 #1
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Linus finishes  at  9:50

 

So   Jenny must run for  50 minutes  =  5/6 hr

 

So

 

D  =  R * T

 

10 km =  R  * ( 5/6) hr

 

10 km /  (5/6) hr = R   = 12 km /  hr  = rate Jenny must run

 

 

cool cool cool

 Jul 23, 2022

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