[quote=PrecalcKid114;59688]need quick help! i dont understand these at all and i have a test tomorrow. damn summer school. anyways
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.
Answer is t(n) = 11n/36 i dont know how to get it though[\quote]
Let be the time the journey on foot takes
Let be the time the journey by bus takes
Let be the total time
Thus we have
Thus we have: