Roja and Pooja start moving in the opposite directions from a pole. They are moving at the speeds of 2 km/hr and 3 km/hr respectively. After 4 hours what will be the distance between them?
A). 12 km
B). 20 km
C). 24 km
D). 4 km
20 km
Distance = Relative Speed * Time
= (2 + 3) * 4 = 20 km
[ They are travelling in the opposite direction, relative speed = sum of the speeds].
9. The speed $3\frac{1}{3}$ m /sec when expressed in km / hour becomes