Question 421916
Solution:
  Denote x km/h the speed of the car. For 5 hours its traveling distance is
 5*x km while the bus for 5 hours travel the distance: 5*30=150 km,since the bus
left 3 hours before the car its total distance from the car is 150+3*30=240 km.
 The car overtake the bus when 5*x=240 where x=48 km/h.

Answer:The car must move 48 km/h.