Gate Exam Category

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

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Gate Other Question
Find the last digit of 12^13^14 Rajat had covered one third of the total distance of his trip when his scooter failed .He then parked it and covered the remaining distance on foot, spending 20 times as long walking as riding. How many times was his riding speed more than his walking speed?
a)20 b)19 c)10 d)9