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Q1. (a) By applying Kirchoff’s Laws in a circuit the following equations were obtained:

24(I₁ - I₂) + 48 I1 = 4.2

16 I₂ - 4(I₁ - I₂) = 0.7

Calculate the values of the currents I₁ and I₂. (8)

(b) Pump A can fill an empty tank in 1 hour 40 minutes. A second more powerful pump, B, can fill the same tank in 40 minutes.

Calculate the overall time to fill the empty tank if pump A runs alone for 30 minutes and then pump B is used to assist pump A. (8)