Two race cars start from the same place and race off in the same direction. The speeds of the two cars are 20 and 40 mph, respectively. How far from the starting point will the two meet if second car left 1 hour after the first car?

Question

Two race cars start from the same place and race off in the same direction.   The speeds of the two cars are 20 and 40 mph, respectively.   How far from the starting point will the two meet if second car left 1 hour after the first car?

anonymous · Answer

okay let the hours be x

anonymous · Answer

so one car has 40 mph speed
and other 20
so if you want to know after how many hours did they meet
it would be 40x = 20(x+1)
x+1 because it left one hour earlier

anonymous · Answer

so you get x = 1 hour

anonymous · Answer

so the 2nd car is traveling for 1 hour = 40x = 40*1 = 40 miles
first car is traveling for x+1 hours,thats 2 hours,so 20*2 = 40 miles
explained,so they meet after driving 40 miles