Mary lives 1365 miles from brady. brady drives at a constant rate of 60 mph and mary travels at a constant rate of 45 mph. if they start driving toward each other at the same time on the same road, how many hours will it take them to meet? a. 10 b. 11 c. 12 d. 13

Let m= distance Mary drives; let b=distance Brady drives. Then m+b=1365:

(45 mph)(t) + (60 mph)(t) = 1365 mi

Then (105 mph)(t) = 1365 mi, and

1365 mi

t = = 13 hours: time req'd for the 2 to meet.

105 mph

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify