a) 10 taps
b) 12 taps
c) 15 taps
d) 18 taps
Answer: b
Explanation:
$$\eqalign{
& \left[ {\frac{{{m_1} \times {h_1} \times {t_1}}}{{{w_1}}} = \frac{{{m_2} \times {h_2} \times {t_2}}}{{{w_2}}}} \right] \cr
& {9_{taps}} \times {20_{\min }} = {t_{taps}} \times {15_{\min }} \cr
& t = 12\,\,{\text{taps}} \cr} $$
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