Count number of buses to yield given waiting time

Question

I'm sorry if my question sounds like beginner. My friends asked me this question and I was a bit confused with this.

Suppose there are four stations in a 60 km loop. If bus speed is 12 km/h how many buses are needed so that the waiting time is at most 5 minutes?

Can this problem be solved? Or does the problem need more detail to be added? Maybe such as time intervals between buses

Thanks,

Answer 1

It takes five hours for one bus to complete a loop around the four stations. To make the waiting time five minutes you would thus need (5 hours / 5 minutes) = 60 buses.