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Two long strings \( A \) and \( B \), each having linear mass density \( 1.2 \times 10^{-2} \mathrm{~kg} / \mathrm{m} \), are stretched by different tensions \( 4.8 \mathrm{~N} \) and \( 7.5 \mathrm{~N} \) respectively and are kept parallel to each other with their left ends at \( x=0 \). Waves pulses are produced on the strings at the left ends at \( t=0 \) on \( \operatorname{string} A \) and at \( t=20 \mathrm{~ms} \) on string \( B \). When and where will the pulse on \( B \) overtake that on \( A \) ?
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