

Total distance covered = length of carriage + length of tunnel = 2 + 58 = 60 km
Speed = 30 km/h
Time taken = Distance/Speed = 60/30= 2 hours
D=S*T
D=60*4=240 Now 240/4=6 hrs
The number is divisible by 6 if it is divisible by 2 and 3 both.
Since all the options are even digits, the number will be divisible by 2. Taking sum of all the digits to check its divisibility by 3. Missing digit must be 0.
It is an identity.
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Total cases that all are seated = 7!
A and B are together = 6!*2!
A and B are not together = 7! – (6!*2!)
Probability = (7! – (6!*2!))/7! = 5/7