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My friend sets out walking at a speed of $3$ miles per hour. I set out behind her $5$ minutes later at $4$ miles per hour. For how many minutes will my friend have been walking when I catch up to her?

 Jan 15, 2021
 #1
avatar+116078 
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In 5 minutes  your  friend  travels for 1/12   of an hour at 3 mph  =  3/12 mi = 1/4 mi

 

You  walk  at 4 mph...so....effectively, you  are traveling at (4 -3)  = 1 mph  

 

So

 

Distance/ Effective Rate   =   (1/4)mi  / ( 1 m/hr)  =  1/4 hr  = 15 minutes  to catch her

 

cool cool cool

 Jan 15, 2021
 #2
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You asked this question yesterday (at lest it was answered yesterday)....are you too lazy to look at your previous posts????????

Knucklehead !

https://web2.0calc.com/questions/plz-help_44847

 Jan 15, 2021

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