What does this : mean

Step-by-step explanation:

That character ( : ) is the 'colon" and in math it represents "ratio."

For example, "the ratio of 5 to 7" would be written 5:7

A colon in math interpretation is usually used in ratios and ratio charts.

The colon is used in mathematics, cartography, model building, and other fields—in this context it denotes a ratio or a scale, as in 3:1.

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.