Question

Two cities C1 and C2 are connected on the opposite ends of a long straight parallel track. The cities are connected by train service as well as bus service. The trains leave either city at regular frequency of one train every ‘x’ minute. The buses ply on a parallel road at a constant speed of 30 km/h. A bus passenger going from city C1 to city C2 observes a train going past him every 20 min while a train goes in the opposite direction every 10 min. The value of x is: (Assume the speed of the trains to be constant)

Answer 1

Answer:

30 mins..

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