Answer:
800 miles
Step-by-step explanation:
Given that:
Total miles driven by Mr and Mrs. Martin's in September = 200 miles
Miles driven in November = 2 times the miles driven in September;
Hence, miles driven in November = (2 * 200) = 400 miles
Miles driven in October = 2 times the miles driven in November ;
Hence, miles driven in October = (2 * 400) = 800 miles