What seems small but fills the whole world
(Homemade not from go ogle)

Air?

Step-by-step explanation:

you can't see air but it fills the whole world

humans

Step-by-step explanation:

humans may not seem really big but they fill up the whole world

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.