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Christopher drives into the city to buy new new hockey equipment. Because of traffic conditions, he averages only 15 mph. On the drive home, he averages 35 mph. If the total travel time is 2 hours, how long does it take him to drive home?

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opudodennis

Answer:

36 minutes

Explanation:

Distance= Time*Speed

Let time taken to go to city be x hours, therefore, time to travel back is (2-x) hours

The distance to and from the city are equal hence

15x=35(2-x)

15x=70-35x

50x=70 hence x=70/50=1.4 hours

Time to drive home will be 2-x=2-1.4=0.6 hours

0.6*60=36 minutes

Therefore, time to travel back home is 36 minutes

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