Calculate the local time of Malindi town in Kenya which is located at longitude 40° East if it is 3:00pm at Tunis in Tunisia which is located at longitude 10° East.

Kwa kuwa miji yote miwili iko upande wa Mashariki, tunatoa longitudo ndogo kutoka kwa kubwa.

$$\text{Tofauti ya longitudo} = 40^\circ \text{ Mashariki} - 10^\circ \text{ Mashariki}$$ $$\text{Tofauti ya longitudo} = 30^\circ$$

Tunajua kuwa $1^\circ$ ya longitudo ni sawa na dakika 4 za saa.

$$\text{Tofauti ya saa} = 30^\circ \times 4 \text{ dakika/digrii}$$ $$\text{Tofauti ya saa} = 120 \text{ dakika}$$

Kubadilisha dakika kuwa masaa:

$$\text{Tofauti ya saa} = \frac{120 \text{ dakika}}{60 \text{ dakika/saa}}$$ $$\text{Tofauti ya saa} = 2 \text{ masaa}$$

Malindi iko Mashariki zaidi kuliko Tunis, kwa hivyo saa za Malindi zitakuwa mbele ya saa za Tunis.
Saa za Tunis ni 3:00 PM.

$$\text{Saa za Malindi} = \text{Saa za Tunis} + \text{Tofauti ya saa}$$ $$\text{Saa za Malindi} = 3:00 \text{ PM} + 2 \text{ masaa}$$ $$\text{Saa za Malindi} = 5:00 \text{ PM}$$

Saa za Malindi ni:

$$\text{5:00 PM}$$