Distance between two cities of 490 km one city was left by the passenger car with a speed of 90 km of hour in 1 hour 30 minutes from other city real the lorry with a speed of 70 km/h left What distance will be between them in 1 hour 90 minutes after departure of the lorry


1 h 30 min. =1.5chasa 1 h 45 min. =1.75chasa

90*1.5=135km rapprochement speed

passed automobile before departure cargo

90+70=160km/ch of

160*1.75=280km two cars passed

490-135-280=75km will be between them in 1 h 45 min. after a lorry exit

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