A bus is moving with a speed of $10 m/s$ on a straight road. A scooterist wishes to overtake the bus in $100 s$. If the bus is at a distance of $1 \;km$ from the scooterist with what speed should the scooterist chase the bus?

Question

$$(a)\;40\; m/s \quad (b)\;25 \;m/s \quad (c)\;10 \;m/s \quad(d)\;20\; m/s$$