If the car starts at a point that's 45 km West of a place, and goes
to a point that's 15 km East of the same place, then the car had to
drive (45km + 15km) = 60 km all together.
Speed = (distance covered) / (time to cover the distance)
= (60 km) / (1.2 hours)
= 50 km/hour .
But the question wants the answer in a different unit,
so we ( I ) have to convert it.
1 km = 1,000 meters
1 hour = 3,600 seconds
Car's speed = (50 km/hr) x (1000 m/km) x (1 hr/3600 sec)
= (50 · 1000 / 3600) m/sec
= 13.89 m/s (rounded)
That's still not the velocity of the car.
Its velocity is
13.89 m/s to the East