Doubt

“A Cycle Crossing Busses Periodically: Between two points X and Y on a straight road consistently buses are departing from Y to X and X to Y at uniform speed every T minutes. A cyclist riding from X to Y at 10 km/hr. Every 18 minute a bus overtakes him in his direction of motion and crosses him every 6 minute in opposite direction. Find the speed of buses and time between departure of two buses.”