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24 December, 13:52

A large ice floe is floating at a speed of 3 kilometers per hour. A polar bear leaves the floe and swims in the opposite direction at 9 kilometers per hour. How long will it be before the polar bear is 4 kilometers away from the floe?

How do I do this? My teacher never teaches me!

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  1. 24 December, 13:53
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    Ok, so the total distance will be 4 kilometers

    remember, distance=speed times time

    the polar bear's distance=9km/h times t or 9t

    t is time in hours

    the floe's distance = 3km/hr times t or 3t

    total disatace=polar bear disatnce+floe's distance=9t+3t=12t

    so when will this distance eqal 4km?

    4=12t

    divide both sides by 12

    4/12=t

    1/3=t

    about 20 mins or 1/3 hour
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