A motor car starts with the speed of 70 km/hr with its speed every 2 hour s by 10km/hr. inhow many hours will it cover 345km?

• d=s*t
  d=70*2=140, in first 2 hrs
  after 2 hrs,speed is 70+10 = 80 kmph
  d=80*2=160,
  till now,
  4 hrs and dist covered is 140+160=300km
  remaining distance is 345-300=45 km
  so,
  to cove 45 km at an speed oh 80+10=90kmph
  t=d/s
  t=45/90
  t=1/2
  therefore total time taken is 4hrs 30 mins
  d=
• 10 years agoHelpfull: Yes(2) No(0)
• forfirst2hrs=140kms completed
  fornext2hrs=160kms
  totally=300kms
  remaining 45kms=.36
  its4.36hrs
• 10 years agoHelpfull: Yes(1) No(2)
• first hour=70
  second hour=70
  third hour=80
  fourth hour=80
  distance =300
  in the fifth hour speed=90km/hr and distance=45km so hr=1/2
  over all time=4.5hr
  
• 10 years agoHelpfull: Yes(0) No(0)
• for first two hours 140 km
  for next two hours 160 km
  totally 140+160=300
  remaining 45 km
  for next two speed will be 90
  there fore for 45 km 30 mts enough
  
  to cover 345 km car takes 4hrs 30 mts to reach
• 9 years agoHelpfull: Yes(0) No(0)