The North-South Express is a pair of trains between Jammu and Chennai. A train leaves Jammu for Chennai exactly at 12 noon everyday of the week. Similarly, there's a train that leaves Chennai bound for Jammu on everyday of the week exactly at 12 noon. The time required by a train to cover the distance between Chennai and Jammu is exactly 7 days and 1 minute. Find the number of trains from Chennai to Jammu which a train from Jammu to Chennai would cross in completing its journey, assuming all the trains are on time.

• Let a train from Chennai to Jammu starts on Day 1 and it reaches jammu on day 8 at 12:01 Hrs
  
  The train which starts from Jammu on Day 8 at 12:00 will cross this Day 1 train (from Chennai) at approx. 12:00:30 Hrs and this train will reach Chennai on day 15 at 12:01 Hrs so it will cross the train which started from Chennai at 12:00 Hrs on day 15 (in between 12:00 Hrs and 12:01 Hrs).
  So it will cross a total of 15 trains.
• 7 years agoHelpfull: Yes(17) No(7)
• 14 trains
  7 trains are in journey when it starts
  after it started its journey it will take 7 days to reach chennai in which 7 trains will departure from chennai
  total 14
• 7 years agoHelpfull: Yes(3) No(2)
• Find the number of trains from Chennai to Jammu which a train from Jammu to Chennai would cross in completing its journey, assuming all the trains are on time.
  the counting should start from day 8 isnt it the question asked is from jammu to chennai
  answer should be 8 according to me
  kindly anyone elaborately explain logically
• 7 years agoHelpfull: Yes(3) No(1)
• 8 trains(ans)
  its asking about a single train(from jammu to chennai) crossing every train(from chennai to jammu).
  as the train starts from jammu it will cross the train reaching jammu at near about 12:00:30hrs.
  in between it will meet all the trains from monday to saturday. and before reaching chennai on sunday it will finally meet the train at 12:00:30 which just left the station for jammu.
• 6 years agoHelpfull: Yes(1) No(0)