Solve a problem in what two ways from these ways rational from Moscow and Tver to St. Petersburg on the same highway two cars left Moscow the cargo speed of the lorry of 50 km/h, automobile from Tver, What speed of the passenger car at the same time if it caught up cargo in 7 hours after departure with distance from Moscow to Tver of 168 km

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1) 50 x 7 = 350 km - from Tver the cars overtook

2) 350 + 168 = 518 km - ponadobmlos to pass laid down. car

3) 518: 7 = 74 km/h speed laid down. car

the 2nd way

(50 x 7 + 168): 7 = (350+168): 7 = 518: 7 = 74 km/h

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