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A bus is moving with a speed of \( 10 \mathrm{~ms}^{-1} \) on a straight road. A scooterist wishes to overtake the bus in \( 100 \mathrm{~s} \). If the bus is at a distance of \( 1 \mathrm{~km} \) from the scooterist, with what speed should the scooterist chase the bus?
(a) \( 40 \mathrm{~ms}^{-1} \)
(b) \( 25 \mathrm{~ms}^{-1} \)
(c) \( 10 \mathrm{~ms}^{-1} \)
(d) \( 20 \mathrm{~ms}^{-1} \)
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