Problem Solving Strategy: Use simpler numbers

Question

It takes Leon 1/3 hour to ride his bicycle from his home to John's home. One day, after he arrived at John's home, Leon realized he had forgotten to bring a book. So he returned home to get the book and then rode back to John's. After visiting, he rode home again. How many hours did Leon ride in all?

Answer 1

1/3 <--- going to John's; he forgot the book

1/3 <--- return home to get the book

1/3 <--- rode back to John's

1/3 <--- went home

4/3 altogether. BUT...

1 hour = 60 minutes

4/3 hours = 1 hour + 1/3 hour = 1 hour and 20 minutes;