Distance

Jan 2008
173
1
A car leaves a starting point and drives at 60 km/hour. A second car leaves the same starting point some time later following the first car at a speed of 75 km/hour. It catches the first car after traveling a distance of 30 km. How many minutes later did the second car leave?

(A) 5 min. (B) 6 min. (C) 12 min. (D) 24 min. (E) None of these
 

skeeter

MHF Helper
Jun 2008
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North Texas
A car leaves a starting point and drives at 60 km/hour. A second car leaves the same starting point some time later following the first car at a speed of 75 km/hour. It catches the first car after traveling a distance of 30 km. How many minutes later did the second car leave?

(A) 5 min. (B) 6 min. (C) 12 min. (D) 24 min. (E) None of these
t = distance/speed

find the difference in time for going 30 km at each speed ... remember to change hrs to min.
 
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