Question

Last Monday the temperature changed at a rate of -3 F per hour. How long did it take for the change in temperature to be -21 F?

Answer 1

`\fbox {7 hours}`

Explanation:

⇒ Rate = -3F/hour

⇒ Starting : -21F

Solving :

⇒ -21/-3

⇒ 7 hours

Answer 2

7 hours

Explanation:

just multiply 3 and 7 to get 21