Two towns A and B are connected by a regular bus service with a bus leaving in either direction every T minutes. A man cycling with a speed of `20 km h^(-1)` in the direction A to B notices that a bus goes past him every 18 min in the direction of his motion, and every 6 min in the opposite direction. What is the period T of the bus service and with what speed (assumed constant) do the buses ply on the road ?

Options

A. 9 min, 40Kmph
B. 12min, 10Kmph
C. 12min, 40Kmph
D. 9 min, 60Kmph

Answer

A