SOLUTION: If the average speed of a car is increased from 50 to 60 kph, the time needed to cover a certain distance is reduced by 30 mins. What is the distance involved?
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Question 252985: If the average speed of a car is increased from 50 to 60 kph, the time needed to cover a certain distance is reduced by 30 mins. What is the distance involved? Found 2 solutions by Greenfinch, richwmiller:Answer by Greenfinch(383) (Show Source):
You can put this solution on YOUR website! At 50 kph, D/50 = T
at 60 kph, D/60 = T - 1/2
For the same distance
D = 50T = 60 ( T - 1/2)
50 T = 60 T - 30
-10T = -30
T = 3
Thus distance is 50 x 3 or 150 km
Check at 50 kph time is 3 hours
at 60 time is 2 1/2 hours
