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At 3:00 P.M., a bank robber is spotted driving north on I-15 at milepost 114. His speed is 124.0 mi/h. At 3:37 P.M., he is spotted at milepost 187 doing 103.0 mi/h.(Assume a straight highway). Assume north to be positive.

What is his average velocity during this time interval? Enter a positive value if the direction is toward north andenter a negative value if the direction is toward south.

mi/h