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Let speed of downstream and speed of stream be 4x and 3x respectively. Speed of current => 3x = 6 => x = 2 km/hr Downstream speed = 4 × 2 = 8 km/h Speed of boat = 8 - 2 = 6 km/hr Upstream speed = 6 - 2 = 4 km/h Distance travelled upstream in 7 hr = 7 × 4 = 28 km
I. 20x² - 93x + 108 = 0
II.72y² - 47y - 144 = 0
I. 3q² -29q +18 = 0
II. 9p² - 4 = 0
I. 2p² - 11p + 12 = 0
II. 2q² - 17q + 36 = 0
I. p2 - 19p + 88 = 0
II. q2 - 48q + 576 = 0
Equation 1: x² - 180x + 8100 = 0
Equation 2: y² - 170y + 7225 = 0
I. 6x² - 13 x + 6 = 0
II. 15 y² + 11 y - 12 = 0
I. (x13/5 ÷7) = 5488 ÷ x7/5
II. (y2/3 × y2/3 ) ÷ √4 = (343y)1/3...
I. 2y2+ 13y + 15 = 0
II. 2x2+ 11 x + 12 = 0
I. 84x² - 167x - 55 = 0
II. 247y² + 210y + 27 = 0
I. x2 + 91 = 20x
II. 10y2 - 29y + 21 = 0
