What is the minimum average speed needed for a car to qualify in a drag race?

AI Thread Summary
To qualify for a drag race, a car must average 254 km/hr over a 1600-meter track. The first half of the track is covered at 227.5 km/hr, taking approximately 12.6 seconds. To determine the minimum average speed required for the second half, the total time for the entire track must be calculated based on the required average speed. The total time allowed for the 1600 meters at 254 km/hr is about 18.9 seconds. Therefore, the car must complete the second half in less than 6.3 seconds to qualify.
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Homework Statement



to qualify for a race a car must achieve an average speed of 254 km/hr on a track 1600 meters long. if a car covers half the track with an average speed of 227.5 km/hr what minimum average speed must it have the second half to qualify?

Homework Equations


speed=distance/time


The Attempt at a Solution


my teacher told us to find the time it took for the first half and i did that by converting 227.5km/hr and getting 63.19m/s=800/t and got 12.6 seconds for the first half. he told us we could use this to solve the problem but I am really confused on how to do that.
 
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If the average speed must be 254 km/hr for the 1600 m trip, what must be the total time for the trip?
 
thank you! i got it right!
 

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