MBA Exam

Can anyone explain the question below:suppose a no. which has 2 at its right end, if 2 is shifted to the left end then the no. obtained is 2 times the earlier number. what is the earlier number?

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MBA Other Question

A tries to hit a target.P(A hitting target) = 0.1.P(exactly 1 hit in 5 shots) =?

1) 0.1*(0.9)^4
2) 0.5*(0.9)^4
3) 0.9*(0.1)^4
4) NONE
The guards of two goods trains are in the respective last carriages of their trains. The two trains A and B of length 200 m and 300 m respectively, begin to enter a 500-metre long tunnel from opposite ends. The guard of one of the trains wants to pick up a flag from the other guard. How long after the instant when the two trains begin to enter the tunnel, does this exchange occur? (Given that speed of train A = 2 m/s, speed of train B = 3 m/s)

1) 180 sec
2) 225sec
3) 220 sec
4) 200 sec