Use front-end estimation to estimate the sum 56.7+23.44
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Travel at the speeds of 65 miles per hour to drive the distance of 310 miles (if the speed in which the person in question is traveling at the same speed) =
310 divided by 65 =
= 4 and
hours
since it is "traveled distance = speed multiplied by time it takes
310 divided by 65 =
= 4 and
since it is "traveled distance = speed multiplied by time it takes