Convert 54km/h to m/s.

1. 15

The correct option is A 15

1 km = 1000 m
1 hour = 60 min = 3600 s

So,
$1km/h=\frac{1000}{3600}m/s=\frac{5}{18}m/s$

For converting speed from km/h to m/s, we multiply km/h by $\frac{5}{18}$.

$\therefore 54km/hr=54\times \frac{5}{18}=15m/s$