Question

An object is traveling at steady speed of 9 4 /5 kilometer per hour how long will it take the object to travel 2 1/5 km first round the nearest integer to find the estimated answer then find the exact answer.

Answer 1

`\begin{gathered} 9\cdot(4)/(5)=(49)/(5)=9.8 \\ 2\cdot(1)/(5)=(11)/(5)=2.2 \end{gathered}`

9.8km------------------------------------->1h

2.2km------------------------------------->xh

`\begin{gathered} \text{Let's use cross multiplication:} \\ (9.8)/(2.2)=(1)/(x) \\ \text{solve for x:} \\ x=(2.2)/(9.8)=(11)/(49)h \\ x\approx13\min \\ x=(660)/(49)\min \end{gathered}`