Question:
The frequency of a MMTS train is 12 minutes. The notice board displayed that next train is 7 minutes late and will arrive at 9:42 am. When did the previous train leave the station?
The frequency of a MMTS train is 12 minutes. The notice board displayed that next train is 7 minutes late and will arrive at 9:42 am. When did the previous train leave the station?
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In time-frequency problems, first remove the delay to get the actual scheduled time, then apply the interval.
Updated On: Jul 15, 2026
- 9:20 am
- 9:23 am
- 9:24 am
- 9:30 am
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The Correct Option is B
Solution and Explanation
Concept:
Train frequency means trains normally arrive at equal intervals.
To find the previous train:
• First find the scheduled arrival time of the delayed train.
• Then subtract one frequency interval.
Step 1: Find the scheduled time of the next train.
Given: Train arrives at: \[ 9:42 \text{ am} \] It is late by: \[ 7 \text{ minutes} \] So scheduled time: \[ 9:42-7=9:35 \text{ am} \]
Step 2: Find the previous train time.
Frequency: \[ 12 \text{ minutes} \] So previous train: \[ 9:35-12=9:23 \text{ am} \] Thus, the previous train left at: \[ \boxed{9:23 \text{ am}} \]
• First find the scheduled arrival time of the delayed train.
• Then subtract one frequency interval.
Step 1: Find the scheduled time of the next train.
Given: Train arrives at: \[ 9:42 \text{ am} \] It is late by: \[ 7 \text{ minutes} \] So scheduled time: \[ 9:42-7=9:35 \text{ am} \]
Step 2: Find the previous train time.
Frequency: \[ 12 \text{ minutes} \] So previous train: \[ 9:35-12=9:23 \text{ am} \] Thus, the previous train left at: \[ \boxed{9:23 \text{ am}} \]
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