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 =  51.077 mph

Solution:

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



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