Question 524845
Car A speed = 100km/h
Car B speed =x

distance = 10 km

time = 1/60 hour

Time by B - Time by A= 1/60 hour

10/100 - 10/(x)=1/60 

LCD = 600x
multiply all terms by 600x

60x-6000=10x
50x=6000
x=6000/50

x= 120 km/h speed of Car B