Once upon a time, we learned in school that the Russians have "wider" tracks than our, because they have less tolerable ground. In truth, decide olny area of sleepers, no track gauge.

Calculate how many millimeters, our track 1435 mm different from the Russian 1520 mm. (meaning how many millimeters of the Russian tsar slashed).

How many percent differs our standard gauge from Russian?

Correct result:

gauge differ by:  85 mm
p =  5.9 %

#### Solution:

$x = 1520-1435 = 85 \ \text{mm}$
$p = 100 \dfrac { 1520-1435}{1435} = 5.9 \%$

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