Distance between two cities of 490 km. From one city vyekhaladno the passenger car with a speed 90km/h. In 1 h 30 min. other city towards to it was left by the lorry with a speed of 70 km / that. What distance will be between them in 1 h 45 min. after departure of the lorry?

6
1) Passed 90 * 1.5 = 135 km for 1 h 30 min. laid down. the car 2) 490 - 135 = 355 km became between automobile and cargo cars at the time of departure of lorry 3) 90 + 70 = 160 km/h the speed of rapprochement of cars 4) 160 * 1 h 45 min. = 160 * 1.75 = 280 km will pass for 1 h 45 min. 5) 355 - 280 = 75 km will be between them in 1 h 45 min.
180
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