Two trains, 300 miles apart are traveling towards each other with one with a constant speed of 70mph and other 50 mph.How long does it take for both to meet/crash?

• Relative speed=70+50=120m/h
  Distance D =300miles
  then time to meet each other=300/120=2.5hrs
• 9 years agoHelpfull: Yes(5) No(0)
• after 1 hr,train A covers 70 miles,train B has (300-50) 250 miles yet to be covered
  after 2 hrs,train A covers 140 miles,train B has (300-100) 200 miles yet to be covered
  after 2.5 hrs,train A covers 175 miles ,train B has (300-125)175 miles yet to be covered
  Therefore,the two trains meet or crash after 2.5 hrs if they start at the same time.
• 8 years agoHelpfull: Yes(0) No(0)