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?

275
1 h is 30 min. =1.5 h 1 h 45 min. =1.75 h old 1) 490-90*1.5=355 (km) - the remained way 2) (90+70)*1.75=280 (km) - both cars together 3) 355-280=75 (km) - distance between them in 1 h 45 min. after departure cargo passed
278
Answer add