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.

Correct result:

v =  51.0766 mph


s=1370 39.37 60=3236214 m t=36 1760=63360 h v=s/t=3236214/63360=51.0766 mph

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