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if 2 is a root of the equation x2+bx+12=0 and the equation x2+bx+q+0 has equal roots, then q = ?

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a train covered a certain distance at a uniform speed.if the train could have been 10 km/hr faster, it would have taken 2 hours less than the scheduled time. and if the train were slower by 10 km/hr, it would have taken 3 hours more then the scheduled time. the distance covered by the train is ? if five times the 5th term of an A.p. is equal to 8 times its eighth term, then 13th term is ?