Answer:
1) MArta's rate= 1/10 = 0.1 miles per minute
2) Ira was the fastest on the last ride
Explanation:
Marta 's rate in miles per minute= distance/ time= 8/80= 1/10= 0.1 miles per minute
Loribeths 's rate in miles per minute= distance/ time= 6/42= 1/7 = 0.142 miles per minute
Ira's s rate in miles per minute= distance/ time= 15/75= 1/5= 0.2 miles per minute
Comparing the three results Ira is the fastest