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Emma is training for a 10-kilometer race. She wants to beat her last 10-kilometer time, which was 1 hour 10 minutes. Emma has already run for 55 minutes. Which inequality can be used to find how much longer she can run and still beat her previous time? (1 hr = 60 min)

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Respuesta :

carlosego
For this case, the first thing that we must take into account is the following conversion:
 1 hr = 60 min
 The time of the first race in minutes is:
 1 hour 10 minutes = 60 minutes + 10 minutes
 1 hour 10 minutes = 70 minutes
 Now we define one variable:
 x: time remaining to beat the previous time
 The inequation that models the problem is:
 [tex]x + 55 \ \textless \ 70 [/tex]
 Answer:
 An inequality that can be used to find how much longer she can run and still beat her previous time is:
 [tex]x + 55 \ \textless \ 70[/tex]

Answer:

x < 15

Step-by-step explanation:

Emma's previous time was 1 hour 10 minutes.  This is equal to

60+10 = 70 minutes.

She has already run 55 minutes; this means the remaining time, x, added to 55 must be less than 70 in order to beat her previous time:

x + 55 < 70

Subtract 55 from each side:

x + 55-5 < 70-55

x < 15