Question

The scale of a railroad train set is 3.5 mm to 1 foot if the link of the model car in this it is 150 mm what is the approximate length of an actual car

Answer 1

The actual length of car is 42.857 foot

Solution:

Given that,

The scale of a railroad train set is 3.5 mm to 1 foot

The link of the model car in this it is 150 mm

To find: Length of actual car

Let "x" be the length of actual acr

From given,

Scale is:

3.5 mm : 1 foot

Then, given that link of the model car in this it is 150 mm

Then we get,

3.5 mm : 1 foot

150 mm : x foot

This forms a proportion and we can solve the sum by cross multiplying

$3.5 \times x = 1 \times 150\\\\x = \frac{150}{3.5}\\\\x = 42.857$

Thus the actual length of car is 42.857 foot