# Mail train

The speed of mail train is 1370 meter per minute. Express it in miles per hour correct to three significant figure . Given that 1 meter =39.37 inches.

Result

v =  51.077 mph

#### Solution:

$s=1370 \cdot \ 39.37 \cdot \ 60=3236214 \ \text{m} \ \\ t=36 \cdot \ 1760=63360 \ \text{h} \ \\ v=s/t=3236214/63360 \doteq 51.0766 \doteq 51.077 \ \text{mph}$

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