A'snail's pace is 60 inches per minute. at this rate how long will it take the snail to crawl 120 feet?

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

Can you me find the missing length. i attached an image.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'