I need help with this.

step-by-step explanation:

mean or average is 40.6

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.

not sure but it may be b, as i said i'm not sure.

x = 3 ± √(5+y)