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7 November, 14:04

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? Answer: minute (s) and second (s)

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  1. 7 November, 15:12
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    Step-by-step explanation:

    1km = 1000 meters

    Let t represent the time it will take them to be 1km (1000 meters) apart.

    Distance = speed * time

    Erica biked at a speed of 6 meters per second. This means that the distance that Erica travelled in t seconds would be 6t.

    Amy biked at a speed of 4 meters per second. This means that the distance that Amy travelled in t seconds would be 4t.

    Since the total distance covered after t seconds is 1km (1000 meters), it means that

    6t + 4t = 1000

    10t = 1000

    t = 1000/10

    t = 100 seconds

    The number of seconds in a minute is 60

    Converting to minutes and seconds, it becomes

    1 minute, 40 seconds
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