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student12468

plz help

Q.8

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解答 0

  • eric
    2019-11-09 23:34:17
    First solve 40×2x=40x+100, where x is the walking speed of Eva
  • student12468
    2019-11-10 11:58:06
    can you tell me why
    •  eric 2019-11-09 23:34:17
    • First solve 40×2x=40x+100, where x is the walking speed of Eva
  • eric
    2019-11-10 14:22:20
    Distance=Speed×Time
    •  student12468 2019-11-10 11:58:06
    • can you tell me why
  • eric
    2019-11-10 14:23:39
    So after 40s, the distances travelled by Howard and Eva are 40×2x and 40x respectively
  • eric
    2019-11-10 14:26:55
    It takes 40s for Howard to catch up with Eva who is 100m ahead initially
  • eric
    2019-11-10 14:28:19
    So the distance travelled by Howard can also be interpreted as the distance travelled by Eva plus 100m
  • eric
    2019-11-10 14:29:36
    Hence we get the equation 40×2x=40x+100
  • eric
    2019-11-10 14:31:57
    Correction: So after 40s, the distance travelled by Howard can also be interpreted as the distance travelled by Eva plus 100m
    •  eric 2019-11-10 14:28:19
    • So the distance travelled by Howard can also be interpreted as the distance travelled by Eva plus 100m
  • student12468
    2019-11-10 16:30:13
    ok,thx
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