In solving a problem, one student makes a mistake in the coefficient of the first degree term and obtains – 9 and – 1 for the roots. Another student makes a mistake in the constant term of the equation and obtains 8 and 2 for the roots. The correct equation was 

What is the value of positive square root of $$\ 14+ 6\sqrt{5}\ $$?

Study the following graph and answer the question that follow.

What is the approximate average number of candidates passed from all the institutes together?

A tower standing on a horizontal plane subtends a certain angle at a point 160 m apart from the foot of the tower. On advancing 100 m towards it, the tower is found to subtend and angle twice as before. The height of the tower is

Speed of train B is 20% more than speed of train A and length of train A and B is 720 meters and 600 meters respectively. If both trains running in opposite direction cross each other in 24 second, then find speed of trains B (in km/hr)?

Find k, if the line 2x - 3y = 11 is perpendicular to the line 3x + ky = -4? 

A watch which gains uniformly is 4 minutes slow at 9 A.M on Sunday and is 4-minute 15 sec. fast at 9 P.M on the upcoming Friday. When was it correct?