Question 1201033
 Let car speed be x km/h
Bus speed = (x+15) km/h

Time taken by both same
 Time = Distance / speed
480 / x = 570/(x+15)
Cross multiply
480*(x+15) = 570 x
480 x + 7200 = 570x
7200 = 570x -480x
7200 = 90x
x = 7200/90
x = 80 
Speed of car = 80 km/h
Speed of bus = 80 +15 = 95 km/h