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A heater boils a certain quantity of water in time \( t_{1} \). Another heater boils the same quantity of water in time \( t_{2} \). If both heaters are connected in series, the combination will boil the same quantity of water in time
(a) \( \frac{1}{2}\left(t_{1}+t_{2}\right) \)
(b) \( \left(t_{1}+t_{2}\right) \)
(c) \( \frac{t_{1} t_{2}}{\left(t_{1}+t_{2}\right)} \)
(d) \( \sqrt{t_{1} t_{2}} \)
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