Write 9 minutes less than chang’s time in algebraic expression

  t-9

Step-by-step explanation:

If t represents Chang's time in minutes, then 9 minutes less is ...

  t -9

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.