Question

64. There is a regular bus service between towns A and B, with a bus leaving towns A and B every T minutes. A
cyclist moving with a speed of 20 km h' in the direction A to B notices that a bus goes past him every 18 minutes in
the direction of his motion and every 6 minutes in the opposite direction. What is the period T of bus service?
a) 9 minute
b) 12 minutes
c) 15 minutes
d) 18 minutes​

Answer 1

Answer:

a) 9 minute period is the answer

Answer 2

I think that the answer is 9 minutes