Question

Nobita's two friends Giyan and Sunio want to see him every weekend, but they live on opposite sides of town.
As a compromise, he tells them that every Sunday, he'll head to the subway station nearest to his apartment at
a random time of the day and will hop on the next train that arrives.
If it happens to be the train traveling north, he'll visit his friend Giyan uptown, and if it happens to be the train
traveling south, he'll visit his friend Sunio downtown. Both of his friends are okay with this plan, since they
know both the northbound and southbound trains run every 20 minutes.
But after a few months of doing this, Sunio complains that he sees Nobita only one out of five Sundays.
Nobita promises he's indeed heading to the station at a random time each day.
Based on the above information answer questions given below:-
What will be the difference in arrival of both the trains.​

Answer 1

Answer:

15 minutes

Explanation:

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