A child, who is 45 m from the bank of a river is being carried downstream by the river's swift current of 1.0 m/s. As the child passes a lifeguard on the river's bank, the lifeguard starts swimming in a straight line until she reaches the child at a point downstream. If the lifeguard can swim 2.0 m/s relative to the water, how long does it take her to reach the child? How far downstream does the lifeguard intercept the child?

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  1. relative distance lifeguard has to swim:45 meters, swimming at 2m/s

    time=45/2=22.5 seconds.

    how far downstream: 1m/s*22.5s=22.5m

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  2. bob pursley, can you answer my question. SCIENCE BIOLOGY. My name is Julia. THanks. I have till 12 am. HELPPPP

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  3. Thanks!

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  4. thanks!

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  5. what rubbish

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