Subject: mathqa
Question: a man cycling along the road noticed that every 15 minutes a bus overtakes him and every 5 minutes he meets an oncoming bus . if all buses and the cyclist move at a constant speed , what is the time interval between consecutive buses ?
Option: 
A: 6 minutes
B: 15 / 2 minutes
C: 5 minutes
D: 8 minutes
Answer: B