A motor starts with the speed of 70 Km/hr with its speed increasing every two hours by 10 Kmph.In how many hours it will cover 345 kms ?

• In 4 hours and 30 minutes it will cover 345kms.
  
  In 1st hour, it finishes = 70km (At the speed of 70km/hr)
  In 2nd hour, it finishes = 140km (At the speed of 70km/hr)
  Now, after 2 hours it increase speed rate from 70km/hr to 80km/hr.
  
  In 3rd hour, it finishes = 220km (speed of 80km/hr)
  In 4th hour, it finishes = 300km (speed of 8okm/hr)
  Now, after 2 hours it increase speed rate from 80km/hr to 90km/hr.
  Per hour = 90km speed means,
  Half n hour = 90/2km => 45km speed.
  
  So, in 4hours 30minutes, it cover 345kms.
• 12 years agoHelpfull: Yes(15) No(2)
• Speed 1 = 70 km/hr
  Time 1 = 2hr
  Distance 1 =speed × time
  Distance1 = 140km
  
  
  Speed 2= 70+10= 80km/hr
  Time 2 = 2 hr
  Distance 2= 80×2 = 160km
  
  Distance left = total distance - distance covered
  Distance left = 345 - 300
  Distance left = 45
  
  Speed 3 = 80+10 =90km/hr
  Distance 3 =45km
  Time 3 = distance
  Speed
  Time 3 = 45/90hr
  Time 3= 1
  2. Hr
  
  
  Total time = 2+2+1
  1. 1. 2. Hr
  
  Total time = 4+4+1
  2. hr. = 9_
  2. hr (answer)
• 10 years agoHelpfull: Yes(2) No(2)
• 73/16hr=4.5625
  initially after 2hrs it covers 140km
  remaining is 205km
  80t=205
  total time is:2+205/80
• 11 years agoHelpfull: Yes(0) No(3)
• 9
  2. Answer
  
• 10 years agoHelpfull: Yes(0) No(3)
• 73/16hr=4.5625
  initially after 2hrs it covers 140km
  remaining is 205km
  80t=205
  total time is:2+205/80
  
• 9 years agoHelpfull: Yes(0) No(0)
• 73/16hr=4.5625
  initially after 2hrs it covers 140km
  remaining is 205km
  80t=205
  total time is:2+205/80
• 7 years agoHelpfull: Yes(0) No(0)