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.
Held on 30 Apr 2025 · Verified 9 Jul 2026.
9 min,40 km/h
25 min,100 km/h
10 min,90 km/h
15 min,120 km/h
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