13/5x -3/4= a. -20/24. b. -9/20. c. -1 1/5. d. -1 9/20

C. -1 1/5

Step-by-step explanation:

1 3/5x -3/4=

8/5 - 3/4

2/5 -3/1= -6/5 =- 1 1/5

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.