AIEEE Exam

The angle between the lines 2x = 3y = -z and 6x = -y = -4z is
option
a) 0
b) 15
c) 30
d) 45

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AIEEE Other Question

A spherical iron ball 10 cm in radius is coated with a layer of ice of uniform thickness
than melts at a rate of 50 cm3/min. When the thickness of ice is 5 cm, then the rate at
which the thickness of ice decreases, is?? If the plane 2ax - 3ay + 4az + 6 = 0 passes through the midpoint of the line joining the centres of the spheres x^2+y^2+z^2+6x-8y-2z=13 and x^2+y^2+z^2-10x+4y-2z=8, then a equals
a) 1
b) 2
c) -1
d) -2