Problem I can't figure out

[dramaindulged]

The problem- A tourist walks n km at 4 km/h and then travels 2n km at 36 km/h by bus. Express the total traveling time t (in hours) as a function of n. Can anybody explain this to me? I keep thinking I should draw it out or something.

 

[Aladdin]

The problem- A tourist walks n km at 4 km/h and then travels 2n km at 36 km/h by bus. Express the total traveling time t (in hours) as a function of n. Can anybody explain this to me? I keep thinking I should draw it out or something.

Distance = Velocity*Time

t = d/V

t(total) = n/4 + 2n/36

t(total) = n/4 + n/18

 

[dramaindulged]

thank you so much