Two cars leave a town at the same time in opposite directions at 50km/h and 60km/h. In how many hours will they be apart 550km apart?
(km/h-kilometre per hour)
(km- kilometre)

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Solution

The cars travel 50+60=110 km in one hour.
So
110km $\to$ 1 hour
550km $\to$ ? hours
Number of hours = 550/110= 5 hours

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