Rihanna has 5 less than 2 times as many homework problems to complete as her friend Terrika. The total number of homework proble
ms that Rihanna and Terrika have left to complete is 19. Write a system of linear equations to model this situation and calculate the number of homework problems each girl has left to complete. Use r to represent the number of problems Rihanna must complete and t to represent the number of problems Terrika must complete.
1 answer:
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Answer:
5 minutes to run 1 kilometer
Step-by-step explanation:
Alonzo takes 12 minutes to run 6 times around a 400-meter track.
6 times around a 400 m track
400 * 6 = 2400 meters
It take 12 minutes to run 2400 meters
2400 meters = 2400/1000 = 2.4km
distance = 2.4 km and time = 12 minutes
Now we find our constant speed
2.4 = speed * 12
divide by 12 on both sides
speed = 0.2
so speed is 0.2 km per minute
Now we find out time when distance = 1km
Distance = speed * time
1 = 0.2 * t
divide by 0.2 on both sides
5 = t
So it take 5 minutes to run 1 kilometer