ATQ, Let the againts the wind speed and with the wind speed of the plane be 'p' km/h and 'q' km/h, respectively. According to question: 36/p + 80/q = 4 ------------(i) And 168/p + 128/q = 11 -----------(ii) Solving (i) and (ii), we get p = 24 and q = 32 So, the upstream speed and the downstream speed of the boat are 24 km/h and 32 km/h respectively. So, the desired percentage = {(32 – 24)/32} × 100 = 800/32 = 25%
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