Scale questions

[ABO944]

Hello there ...

Having trouble working this out! Can anyone help me please?

A earth distance of 45nm is shown on a chart by a distance of 12 inches. The scale of the chart is:

a)1:27,400
b)1:36,500
c)1:365,000
d)1:274,000

The other question is ...

A chart represents 20 statute miles by 20 centimetres. The scale of the chart is:

a)1:100,000
b)1:161,000
c)1:1,610,000
d)1:1,200,000

Thanks a lot

Hope someone can help ....

Best regards,

Thicko

[NineEighteen]

Scale = CD/ED (Chart Distance/Earth Distance)
Make distances into the same units
cancel down
I Hope that helps

I got (d) and (b)

0918

[whydididoit]

Hello there ...

Having trouble working this out! Can anyone help me please?

A earth distance of 45nm is shown on a chart by a distance of 12 inches. The scale of the chart is:

45*72960/12

72960 is the number of inces in a NM.. so I would go with d (i got 273600)

The other question is ...

A chart represents 20 statute miles by 20 centimetres. The scale of the chart is:

20SM is about 32km so..

32*1000*100/20 = 160,000 so i would go with b

sm*meters*cm/chart distance.


Hope it helps