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Erica and Amy started biking in the opposite directions at the same time from the same place. Erica biked at a speed of 6 meters per second and Amy biked at a speed of 4 meters per second. How soon were they exactly 1 km apart?

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Since they are moving in opposite directions, this is the same as Amy staying still and Erica biking at 10 meters per second away from her.

To travel 1km = 1000m at 10 meters per second, you need 1000/10 = 100 seconds.

The time at which they were exactly 1 km apart is; 100 seconds

What is total distance covered?

We are told that Erica biked at a speed of 6 m/s while amy biked at a speed of 4 m/s.

Thus;

6m/s = 0.006 km/s

4 m/s = 0.004 km/s

We know that speed * time = distance.

Thus, for them to be 1 km apart;

0.006t + 0.004t = 1

0.01t = 1

t = 1/0.01

t = 100 s

Read more about distance at; https://brainly.com/question/4931057

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