When Luc goes to school on foot and comes back by bike, it takes him 1 hour and 1/2. If he makes the two trips with his bike, it takes him just 1/2h. How long does it take him to walk back and forth?

Answer 1

Each bike trip takes 15 minutes (divide 1/2 hour, or 30 minutes, by 2).

1.5 hours equals 90 minutes

Subtract the original total minus one bike trip, because Luc only took his bike once.

That is 90-15.

90-15= 75 minutes walking one way

Multiply this by 2 to get 150 minutes

Divide 150 by 60 to get time in hours

This is equivalent to 2.5 hours