..and I will no longer be interested in the job if you think answering a question like that is a worthwhile use of my time, or yours.
It's trivially easy to figure out how to calculate a rough number. I'd go so far as to say blatantly obvious. It's also a waste of time to actually do it.
When it comes to the real world, an estimate that rough, based on no actual data (since the actual dimensions of a golf ball or the hypothetical, poorly defined bus are not available), is not something I'm ever comfortable acting on. In reality, you can always come up with better data than that.
It's trivially easy to figure out how to calculate a rough number. I'd go so far as to say blatantly obvious. It's also a waste of time to actually do it.
When it comes to the real world, an estimate that rough, based on no actual data (since the actual dimensions of a golf ball or the hypothetical, poorly defined bus are not available), is not something I'm ever comfortable acting on. In reality, you can always come up with better data than that.