# Velocity problem

1. Jul 12, 2015

### mike rach

1. The problem statement, all variables and given/known data
John is on a bike starts his trip at a speed of v=18km/hr and two hours later Derek is on a motorcycle follows at a speed of 72km/hr. How far away from the start point they will meet? How is this problem solved?

2. Relevant equations

3. The attempt at a solution

2. Jul 12, 2015

### Dr. Courtney

Express d(t) for each moving object.

Set them equal.

Solve for t.

Compute d(t) at that time.

3. Jul 12, 2015

### RyanH42

V=x/t.So use this formula to reach "How many meter john travel in 2 hours"
Lets call it $x_1$.Now the time pass same both of them.
$x_1$+VJohntJohn=VDerektDerek
Use this equation to find solution.