#### Answer

a.) 3 hr.
b.) 300 sec

#### Work Step by Step

a.) 180 min = 3 hr
You are converting from a smaller unit to a larger unit (a minute is less than a second), so divide.
Because 60 min = 1 hr, divide by 60 and write the fraction in lowest terms
180 min = 180 ÷ 60 = 3 hr.
b.) 5 min = 300 sec
You are converting from a larger unit to a smaller unit (a minute is larger than a second), so multiply.
Because 1 min = 60 sec, multiply by 60.
5 min = 5 * 60 = 300 sec.