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As per condition , initial ratio of the speed

of passenger train to that of the super fast train is 1:4.

Initially, passenger train takes 4/5 or 48 mins hr

to travel from B to A and superfast train train

takes 1/5 hr or 12 mins to reach stn A from Stn B.

when 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

increased their speed. If the super fast train doubles its speed,

it covers distance in 6 mins and remains 14 mins behind schedule.

to maintain schedule, passenger train has to cover the

distance in 48-14 = 34 mins.

so final ratio of speeds will be 6:34 or 1:6 (approx)

please provide the solution to the above questions.