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     EduGorilla 
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    Only a single rail track exists between stations A and B. One hour after the north bound, superfast train N leaves station A for station B, a south bound passenger train S reaches station A from station B. Speed of the superfast train is twice that of a normal express train E, while speed of a passenger train S is half that of E. On a particular day, N leaves for station B from station A, 20 minutes behind the normal schedule. In order to maintain the schedule, both N and S increase their speeds. If the superfast train doubles its speed, what should be the ratio (approximately) of the speed of passenger train to that of the superfast train so that passenger train S reaches exactly at the scheduled time at station A on that day?

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