Answer: He spends more time trading stickers by 15 minutes. Step-by-step: 1 hour is 60 minutes. So 2 hours is 120 minutes. 120 minutes plus his 20 minutes is 140 minutes. Subtract it from his homework time and he spends 15 more minutes trading stickers.
Change each mixed number to an improper fraction.Multiply by the reciprocal of the divisor, simplifying if possible.Put answer in lowest terms.Check to be sure the answer makes sense.
