Alice rides on a flat road at $12$ kilometers per hour (kph), downhill at $30$ kph, and uphill at $6$ kph. Bob rides on a flat road at $15$ kph, downhill at $40$ kph, and uphill at $8$ kph. Alice goes from town $A$ to town $B$, a distance of $18$ km all uphill, then from town $B$ to town $C$, a distance of $30$ km all flat, and then back to town $A$, a distance of $24$ km all downhill. Bob goes the other way around using the same route. How many more minutes does it take Alice to complete the $72$-km ride than it takes Bob?