Question

Liam's parents are driving three times as fast as Liam is biking, but they left later than he did. If his parents caught up with him two hours after he left, how much later than Liam did they leave?

Answer 1

Answer:4 hours

Explanation:

Nothing

Answer 2

Answer: Liam leave 4 hours before his parents.

Explanation:

Let the speed of Liam be x

Let the speed of Liam's parents be 3x

In 2 hours, his father caught him,

Distance covered by his father = 2(3x)=6x

Total time of Liam covered 6x distance in (t+2) hours.

According to question,

`6x=x(t+2)\\\\6=t+2\\\\t=6-2=4\ hours`

Hence, Liam leave 4 hours before his parents.