Question 182931
when a C. bus leaves the B. station;
there is a B. bus 1/2 hr from the B. station,
and another B. bus 1 hr behind the first,
and another B. bus 2 hr behind the first,
and another B. bus 3 hr behind the first,
and finally a 5th B. bus 4 hr behind the first


the C. bus will meet all 5 of these B. busses
PLUS
during the 5 hr trip, 5 more B. busses will leave the C. station and meet the C. bus



this means that the C. bus will meet 10 B. busses