A motorcyclist left town X for Y. He rested at Y for half an hour and continued to Z, which is 80km away from Y, for 1½ hours. He rested at Z for one hour and returned at a speed of 70km/h. Complete the motorcyclist's journey.

Ili kukamilisha grafu, fuata hatua hizi:

• Kupumzika Y: Mwendesha pikipiki alifika Y saa 8:00 asubuhi (kilomita 60 kutoka X). Alipumzika kwa nusu saa. Hivyo, chora mstari ulionyooka mlalo kutoka (8:00 asubuhi, 60 km) hadi (8:30 asubuhi, 60 km).
• Kusafiri Y hadi Z: Aliondoka Y saa 8:30 asubuhi na kusafiri kilomita 80 hadi Z kwa saa $1\frac{1}{2}$.
  • Umbali wa Z kutoka X ni $60 \text{ km} + 80 \text{ km} = 140 \text{ km}$.
  • Muda wa kufika Z ni $8:30 \text{ asubuhi} + 1 \text{ saa } 30 \text{ dakika} = 10:00 \text{ asubuhi}$.
  • Chora mstari kutoka (8:30 asubuhi, 60 km) hadi (10:00 asubuhi, 140 km).
• Kupumzika Z: Alipumzika Z kwa saa moja. Hivyo, chora mstari ulionyooka mlalo kutoka (10:00 asubuhi, 140 km) hadi (11:00 asubuhi, 140 km).
• Kurudi X: Aliondoka Z saa 11:00 asubuhi na kurudi X (kilomita 0) kwa kasi ya 70 km/h.
  • Muda wa kurudi ni $\frac{140 \text{ km}}{70 \text{ km/h}} = 2 \text{ saa}$.
  • Muda wa kufika X ni $11:00 \text{ asubuhi} + 2 \text{ saa} = 1:00 \text{ mchana}$.
  • Chora mstari kutoka (11:00 asubuhi, 140 km) hadi (1:00 mchana, 0 km).