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## Homework Statement

The initial distance between two particles is 0.70 km. The particles head towards each other at speeds of 2.5 m/s and 4.5 m/s, respectively.

## Homework Equations

a)When will they meet?

b)Where will the meeting take place?

## The Attempt at a Solution

a)

they are closing at a speed of 2.5+4.5=7m/s (which we call the effective speed)

t=700/7 = 100 s.

so they will meet after 1.67 mins.

b)

x1=2.5*100=250m

x2=4.5*100=450m

the meeting will take place 250m from where the slower particle started and 450m from where the faster particle has started.