Part A-Well, Miranda is going 4mph, so the answer would be t=m/4, because it's how many miles she's traveled divided by 4 to get how long she's been skiing. With the info we have, we could also write 0.5=2/4
Part B-So, we have that m=5.2, so we do t=5.2/4 5.2/4=1.3, so we have 1.3=5.3/4. So, she's been skiing for 1.3 hours.