Syntel Company Numerical Ability LCM and HCF

LCM of 3 no's is 120 which of the following no must not be their HCF

a. 8 b.24 c.12 d.24 e. 30

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Syntel Other Question

a+b+c=0, then roots of ax^2+bx+c=0 is

1.imagenary 2.real 3.coincidental 4.zero
2 pipes can fill a tank in 10 and 20 minutes if the tank is perfect. But there is a hole in the tank that can
empty it in 30 minutes. If both the pipes are opened simultaneously, how long will it take to fill the tank?