Speed of a boat in still water is 9 kmph and speed of stream is 6 kmph. A man rows to a place at a distance of 30 km and come back to starting point. The total time taken by him is:
Rate upstream = 9 – 6 = 3 kmph Rate downstream = 9 + 6 = 15 kmph Time taken to go upstream = 30/3 = 10 hr Time taken to go downstream = 30/15 = 2 hr Total time = 10 + 2 = 12 hrs
I. 2x² - 11x + 12 = 0
II. 12y² + 29y + 15 = 0
I. 7x² + 27x + 18 = 0
II. 19y² - 27y + 8 = 0
I. x + 1 = 3√ 9261
II. y + 1 = √ 324
I. 3p² + 13p + 14 = 0
II. 8q² + 26q + 21 = 0
I. x2 + 24x + 143 = 0
II. y2 + 12y + 35 = 0
I. 2x2- 5x - 33 =0
II. 2y2+ 5y - 25 = 0
I. x² - 33x + 270 = 0
II. y² - 41y + 414 = 0
I. y² + y – 56 = 0
II. 2x² + 11 x – 40 = 0
I. p2 - 19p + 88 = 0
II. q2 - 48q + 576 = 0
I. 2x² + 11x + 12 = 0
II. 2y² + 19y + 45 = 0
