Someone me with this problem, I am stuck

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In summary, the race car driver must drive at an average speed of 137 km/hr for the remaining three-quarters of the race in order to have an overall average speed of 100 km/hr for the entire 100-kilometer race. This can be calculated by dividing the total distance she needs to cover (75 kilometers) by the remaining time she has to complete the race, which is 0.548 hours. Therefore, the driver must maintain an average speed of 137 km/hr for the remaining 55 minutes and 12 seconds of the race.
  • #1
astudentinneed
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here is the question:

A race car driver sets out on a 100-kilometer race. At the quarter-way marker, her pit crew radios that she has averaged only 60 km/hr. How fast must she drive over the remaining distance in order to average 100 km/hr for the entire race?

please help me out, I have been working on this for 2 hrs now, I am stuck?

would I use the average velocity formula? but then I get a screwed up answer like

avg v = 160km/hr / 1.167hr = 137.1 km/hr^2? can someone please help me out, but then what is 137km/hr^2 in standard units?? I got like .0105m/s^2
 
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  • #2
Here's a hint: How much total time does she have to complete the race if she is to average 100 km/hr? How much time has she spent on just the first quarter?
 
  • #3
try using the definiton of average speed which is "total distance/total time"
 

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