Funny story - throwing contests hours

Three visitors went to London and Big Ben clock tower climb and
decided to do a contest. They will throw their watches from above, ran
down the stairs and tried to catch the watches before touching the
ground.
The first tourist threw his watch, the new run three steps and had
heard his watch broke slammed into the ground.
Tourists both throws his watch and only requires two steps when he
heard his watch broke.
The third throw watches from the tower, jogged down the stairs, go to
the candy store, buy a snack, walk back to Big Ben and capture his
watch.
"How could you do that?" asked one of his friends.
"My clock is more than 30 minutes."