math

posted by wa

Anna starts the race 10m ahead of ping.ping runs at 20%faster tan anna`s speed.they will be level in the race after 9seconds.find average speed of anna

  1. Steve

    if anna's speed is s, then since distance = speed*time,

    9s = 9(1.2s)-10
    9s = 10.8s - 10
    1.8s = 10
    s = 5.55 m/s

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