20
25
35
30
Answer is Right!
Answer is Wrong!
The correct answer is 30 minutes.
During TFC on single line, when line clear is obtained for more than one train, trains are run at an interval of 30 minutes. This is to ensure that there is enough time for the trains to pass each other safely.
Option A: 20 minutes is too short an interval. This would not allow enough time for the trains to pass each other safely.
Option B: 25 minutes is a bit longer than the required interval, but it is still safe.
Option C: 35 minutes is too long an interval. This would cause delays in the train schedule.
Option D: 30 minutes is the correct answer. It is the minimum interval required to ensure safe train operation.