A car travels along a straight road at a constant speed of 54 km h−1^{-1}−1.
Express this speed in m s−1^{-1}−1.
Tick one box.
0.90.90.9 m s−1^{-1}−1
151515 m s−1^{-1}−1
909090 m s−1^{-1}−1
194.4194.4194.4 m s−1^{-1}−1