Answer
a. Time taken for the total 300-mile trip =5.19 h
b. Lisa's average speed for the 300-mile trip can be found by calculating (52+65+58)/3.
Work Step by Step
a. Time taken for the total 300-mile trip =$ (100\div52)h+(100\div65)h+(100\div58)h $
= $1.92h + 1.54h + 1.72h$
=$5.19h$
b. Lisa's average speed for the 300-mile trip can be found by calculating (52+65+58)/3 because each leg of the trip is the same length.
