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Find the last digit of 12^13^14

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Find the last digit of 10^11^12 Two trains of length 200 m and 100 m simultaneously wnter a tunnel of length 300m from opposite ends at the same time on parallel tracks.The respective speeds of the two trains are 36 kmph and 18 kmph.After how much time from the instant the two trains entered the tunnel will the tunnel be free of traffic again?
a)40 seconds b)30 seconds c)120 seconds d)80 seconds