solve.
two planes travel toward each other from cities that are 780km apart at rates of 190 km/h and 200km/h. They started at the same. In how many hours will they meet?

• Suppose they meet x hours after takeoff then
  190x+200x=780
  =>x=2 so they will meet after 2 hours
  
• 10 years agoHelpfull: Yes(0) No(0)