Announcement

Collapse
No announcement yet.

help with scale

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • help with scale

    Hi guys

    wonder if anyone can help me with a question , what am i missing ?????

    A fix obtained at 10:00 gave a chart distance traveled of 6.5 inches in 50 minutes . the scale of the chart is 1: 2 000 000 and there are 378 nm to go to the destination . The ETA is

    a- 12:20
    b- 11:46
    c: 13:20

    In the answer they give it as b . their explanation looks like this

    42/60x6.5 =7.8inches

    ED= 7.8 x 2 000 000 /6080 x12 = 213.8nm

    ETA = 378 nm @ GS 213.8 = 1hr 46 min + 10:00 = 11:46

    i get the rest , i am just a little lost as to where they got the 42 at the beginning of the equation...

    what am i missing ?

    cheers

    G
Working...
X