Kujumlisha muda

Kitufe hicho hufaa kwa masaa, dakika na sekunde. Andika 3, bonyeza , andika 30, bonyeza , andika 45, kisha bonyeza . Andika 6, bonyeza , andika 45, bonyeza , andika 36, kisha bonyeza : $\displaystyle 3\,\text{h}\,30\,\text{min}\,45\,\text{s} + 6\,\text{h}\,45\,\text{min}\,36\,\text{s}$ ni 10°16'21", yaani $\displaystyle 10\,\text{h}\,16\,\text{min}\,21\,\text{s}$.

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