In a 1224 km car race, Peter drove at a speed of 180 km/h while David's speed was 10 km/h less. How much sooner did Peter finish the race than David?

Question

anonymous · Answer

d=vt
t=d/v
Time for Peter = 1224/180
Time for David = 1224/170
Difference in time, in hours, between David and Peter:
1224/170-1224/180

anonymous · Answer

7.2-6.8= .4?

anonymous · Answer

yes

anonymous · Answer

He finished .4 hours ahead of David, or 24 minutes

anonymous · Answer

thanks cause i didn't really get it because i did it the other way around.

anonymous · Answer

You could've gotten the negative 0.4, it just tells you he finished ahead of David