His relative speed in the first case will be faster than the second one.
Think about two bodies going in the same direction but at different speeds.
Let x km/hr be the first body's speed.
And the second body moves at a speed of y km/hr.
They are moving at a relative speed of (x - y) km/hr, where x>y.
After then, the time when the two bodies collide equals the distance travelled divided by the relative speed, or dkm/(x - y) km/hr.
We now understand that an object's relative speed is its speed in relation to another object.
Therefore, if the time after which both bodies move is provided, let's assume that time = t hours.
Distance travelled in t hours is then calculated as follows: (x - y) km/hr * t hrs.
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