buses to the stadium leave central station every 10 minutes buses to the zoo leave central station every 16 minutes both buses leave central station at 4 p.m. find the next time both buses will leave central station at the same time.

Answer 1

buses to stadium leave :10 20 30 40 50 60 70 80 90 ....
buses to zoo leave 16 32 48 64 80 96 ....

ahhh, looks like we need the lowest common multiple.

Answer 2

5:20 pm minutes after 4:00 pm