11. On Qingming Festival, the students take a bus to the martyrs' cemetery to pay respects. If the bus increases its speed by one-fifth after driving for 1 hour, it can arrive 20 minutes earlier than the scheduled time; if the bus first travels 72 kilometers at the original speed and then increases its speed by one-third, it can arrive 30 minutes earlier than the scheduled time. How many kilometers is it from the school to the martyrs' cemetery?
【Key Points】Journey
【Answer】216 kilometers
【Analysis】Proportion Method
(1) Original speed: Later speed $=5: 6$
Original time: Later time $=6: 5$
Original time $=6 \times 20=120$ minutes $=2$ hours, total time is $2+1=3$ hours;
(2) Original speed: Later speed $=3: 4$
Original time: Later time $=4: 3$
Original time $=4 \times 30=120$ minutes $=2$ hours, the time taken to travel 72 kilometers at the original speed is $3-1=1$ hour; the distance from the school to the Martyrs' Cemetery is $72 \div 1 \times 3=216$ kilometers.