Exam Maths Puzzle Numerical Ability

what will be the last non-zero digit of 30!

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One day ranjan found that gas is leaking from the cylinder when he entered into his room.he called two of its neighbors and informed them. each neighborscall other two neighbor ans so on.. . if one call making takes 30 sec and getting away from building takes 90 seconds then how much time will it take for all person living there to run away from that 375-room building if each room has only one person in it. a^b+b^a=326 what is d value f a,b??