[tex]\text{Given that Jake completed a marathon race in 3 hours and 12 minutes.}\\ \\ \text{we need to find this time in decimals. so we will convert 12 minutes into hours}\\ \\ \text{We know that there are 60 minutes in 1 hour. }\\ \\ \text{so in 1 minute there will be}=\frac{1}{60 }\text{ hour}[/tex]
[tex]\text{hence in 12 minutes we have}=\frac{1}{60}\times 12=\frac{1}{5}=0.2 \text{ hours}\\ \\ \text{hence the Jake's running time is}=3\text{hours + 12 minute}\\ \\ =3\text{ hours}+0.2 \text{ hours}\\ \\ =3.2 \text{ hours}[/tex]
Hence, Jake's running time in decimal is: 3.2 hours
