Two cities X and Y are connected by a regular bus service with a bus leaving in either direction every T min. A girl is driving scooty with a speed of 60 km/h in the direction X to Y notices that a bus goes past her every 30 minutes in the direction of her motion, and every 10 minutes in the opposite direction. Choose the correct option for the period T of the bus service and the speed (assumed constant) of the buses.

1. A. 15 min, 120 km/h
2. B. 9 min, 40 km/h
3. C. 25 min, 100 km/h
4. D. 10 min, 90 km/h

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