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After every 45 min trip, a car will take a 15min break. In highway, the car's rate is 60m/h, and in country road, the rate is 40m/h. In a 4 hour trip, the car can travel how many more miles in highway than in country road?

Re: Speed Distance!! [#permalink]
26 Aug 2011, 11:59

DeeptiM wrote:

After every 45 min trip, a car will take a 15min break. In highway, the car's rate is 60m/h, and in country road, the rate is 40m/h. In a 4 hour trip, the car can travel how many more miles in highway than in country road?

effective running time will be 3 hrs ( Subtract 4 * 15 mins from the 4 hr trip)

Highway distance = 60 * 3

County Distance = 40 * 3

so effective differnce in distance = 180-120 = 60 miles.

Re: Speed Distance!! [#permalink]
27 Aug 2011, 07:11

1

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Q. After every 45 min trip, a car will take a 15min break. In highway, the car's rate is 60m/h, and in country road, the rate is 40m/h. In a 4 hour trip, the car can travel how many more miles in highway than in country road?

Solution :

We know that for every 45 min ,the car will take 15 min break. So,for 4 hours travel the car would take 15min *4 = 1 hour break.

Hence,Total time for which the car would travel is 3 hours only (and not 4 hours as 1 hour goes for break).

Now , we know the rate at which the car can travel in both kind of roads .Lets calculate the distance travelled :