Question 304053
speed of one car = 50 kmph

Let this travel x miles when thay are 300 kms away

speed of other car = 40 kmph

this would have traveled 300-x in the same time

x/50 = 300-x /40

40x=50(300-x)

40x=15000-50x

90x= 15000
x= 15000/90

x= 166.66 km

166.66 /50= 3.33 hours

they will be 300 km apart after 3.33 hours